This gold mine was discovered by accident.A:by air B:by chance C:at large D:at ease

题目
This gold mine was discovered by accident.

A:by air
B:by chance
C:at large
D:at ease
相似考题

1.They have discovered a new medical herb, which they have ________ a large number of patients and found to have great healing power.A. operatedB. tried onC. took onD. tried with

2.We work closely()every large airline like Air China, Air France and American Airlines.A、inB、toC、with

3.Passage FourArchimedes was a famous Greek mathematician and scientist. He was born around 287 BC and he died in the year 212 BC.Archimedes is most well-known for one specific idea that he came up with. "Archimedes's Principle" states that a solid object which is immersed in a liquid is pushed up by a force which is equal to the weight of the water that the object moves. For example, if you put a piece of wood and a piece of gold the same size in water, only the wood will float. Both the wood and gold move the same amount of water, but the wood weighs less than this water, while the gold weighs more.It is believed that Archimedes discovered this principle when the king of Syracuse asked him to solve a problem. The king wanted to know if his crown was pure gold or a mixture of gold and silver. The king, of course, did not melt his crown to find out. The idea came to Archimedes as he lowered himself into his bath. He noticed how the water spilled out of the tub. He decided to use the same idea for the crown. He knew that a gold crown immersed in water would weigh more than one made of silver. The experiment was done and the goldsmith was proved guilty of trying to cheat the king.48. A good title for the selection is______.A. ArchimedesB. Archimedes's PrincipleC. A Gold and Silver CrownD. The King of Syracuse

4.In the 19th century, gold was first ________ in California.A.incoveredB.recoveredC.uncoveredD.discovered

更多“This gold mine was discovered by accident.A:by air B:by chance C:at large D:at ease”相关问题

  • 第1题：

    患者男性,73岁,FEV1<30%预计值,CAT评分18分,他在过去一年中有3次加重。根据慢阻肺综合评估,请问该患者属于( )

    A.GOLD3级，D组

    B.GOLD4级，B组

    C.GOLD4级，D组

    D.GOLD3级，B组


    答案：C

  • 第2题：

    On a weather map, a large letter “H” means ______.

    A.a high pressure area with cool, dry air, and fair weather

    B.a high pressure area with warm, moist air, and inclement weather

    C.horse latitudes, with rough seas and strong winds

    D.a heavy squall line near the “H”


    正确答案：A
    在天气图上大写字母H的意思是伴随阴凉，干燥和晴好天气的高压。

  • 第3题：

    The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.

    A.large conical springs

    B.compressed air pressure

    C.hydraulic pressure

    D.exhaust gas pressure


    正确答案：B

  • 第4题：

    Cargo transfer operations on a tank vessel need NOT be stopped when ______.

    A.a tug comes alongside while the tanker is loading grade D and E cargoes

    B.a large，fresh oil spill is discovered immediately adjacent to the side of the tanker

    C.there is an electrical storm in the vicinity

    D.there is a fire on the dock or on a nearby vessel


    正确答案：A

  • 第5题：

    At the middle pressure and large air quantity,_________ is more suitable.

    A.an axial flow fan

    B.a radial flow blower

    C.a centrifugal fan

    D.an auxiliary blower


    正确答案：A

  • 第6题：

    The discussion was so prolonged and exhausting that ________ the speakers stopped for refreshments.

    A. at large
    B. at intervals
    C. at ease
    D. at random

    答案：B
    解析：
    因为这个讨论是prolonged and exhausting 的，prolonged and exhausting就表达了作者的态度，所以空格处填入的词语应该是一中性词。答案是B，at intervals（时不时地）。At large“详细的”；at ease“自由自在地”；at random“胡乱地”。

  • 第7题：

    The police knew the （） of the accident.

    • A、cause
    • B、reason
    • C、result

    正确答案:A

  • 第8题：

    CEA的抗原决定簇中具有较高特异性的是（）

    • A、Gold2～4
    • B、Gold1～3
    • C、Gold3～4
    • D、Gold4～5
    • E、Gold2、Gold4

    正确答案:B

  • 第9题：

    问答题
    The worst pollution threat is concentrated in and near large cities. There the people-made pollutants increasingly surpass the ability of air and water to dilute (冲淡；稀释) the contaminants (污染物) to safe levels. The natural ecological cycle depends on plants, which absorb some pollutants and release oxygen to the air. But near large cities, natural vegetation becomes scarce, and introduced trees, ornamental shrubs and gardens are far from adequate in absorbing motor vehicle and industrial air pollutants. Finally, some pollutants, most notably atomic waste, may continue to contaminate air, land, and water for thousands of years. Therefore, ecocrisis—ecocatastrophe or ecocide—has been for some time one of the major concerns of not only the ecoactivists and environmentalists, but of many scientists of other fields and the government authorities of many countries as well.

    正确答案：
    大城市及其周边是污染最严重的地方。在那里,人为污染物的扩散超过了空气和水将污染物分解稀释到安全水平的能力。自然界生态循环依赖于植物;植物吸收一些污染物,把氧气释放到空气中。但邻近大城市的地区,天然植被日见稀少,而移植的树木、观赏灌木及花园又远不足以吸收机动车辆和工业带来的空气污染物。最后,有些污染物,尤其是臭名昭彰的原子能废料,可能会继续污染空气、土地和水达几千年之久。因此,生态危机——也称为生态灾难或生态灭绝——一段时期以来不仅是生态活动家和环保主义者关注的主要问题,而且引起了其他领域许多科学家和许多国家的政府当局的重视。
    解析： 暂无解析

  • 第10题：

    单选题
    Cargo transfer operations on a tanker need NOT be stopped when（）.
    A

    a tug comes alongside while the tanker is loading grade D and E cargoes

    B

    a large，fresh oil spill is discovered immediately adjacent to the side of the tanker

    C

    there is an electrical storm in the vicinity

    D

    there is a fire on the dock or on a nearby vessel


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）
    A

    quantity of air it takes in and retains in the cylinders during a given time period

    B

    proportion of trapped air that is utilized in the combustion process

    C

    thermodynamic efficiency of the engine cycle

    D

    all of the above


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    On a weather map,a large letter “h” means（）
    A

    a high pressure area with cool, dry air and fair weather

    B

    a high pressure area with warm, moist air and inclement weather

    C

    horse latitudes, with rough seas and strong winds

    D

    a heavy squall line near the “H”


    正确答案： B
    解析： 暂无解析

  • 第13题：

    Man has always wanted to fly.Even as long as eight hundred years ago, an Englishman had tried.He made a (1)of wings from chicken feathers and fixed them to his shoulders.Then he jumped om a tall building.As you can imagine, he did not fly very far.(2) he fell to the ground and broke several bones.The first real attempt at flying took place in France in 1783.The two Mongolian brothers knew that hot air rose.If they could

    fill a large balloon(3)hot air, they thought it would rise into the air and fly.They were right.They made a very large hot air balloon of cloth and paper.It measured ten meters it diameter.They filled it with hot air and the balloon got two hundred meters into the air.It fell into earth about three kilometers away.

    At the next attempt, they (4) passengers use a bal loon to rise into the air and fly.We do not know what the passengers fell about the trip as they were a cock, a duck, and a sheep But we (5) know that the trip lasted eight minutes and the animals landed safely.(完型填空)

    A.Instead

    B.Pair

    C.Do

    D.Arranged

    E.With


    参考答案：BAEDC

  • 第14题：

    ---Ease to five! ---Reply: Ease to five! ---Report: __________.

    A.Ease to five

    B.Port five

    C.Five

    D.Yes


    正确答案：B

  • 第15题：

    题干材料：Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be impracticable to maintain ambient conditions within the comfort zone by air conditioning or any other means. The normal practice is to provide copious mechanical ventilation; in boiler rooms, the quantity is equated to the combustion requirements, while in a motor ship engine room the supply may be 25-50% in excess of the requirements of the engines.

    The axial flow fan is particularly suited to handle these large air volumes at the moderate pressures required, while of course the “straight-through” flow feature places it at an advantage over the centrifugal fan.

    The increasing adoption of automation, with the provision of a separate control room makes less significant the fact that comfort conditions cannot be maintained in the engine room all the time.

    问题：Which of the following devices should be taken to maintain ambient conditions of the boiler and machinery space?

    A.air compressor

    B.air cooler

    C.air-conditioning plant

    D.mechanical ventilation plant

    In a motor vessel, the air quantity which the engine room need is_______ of the requirements of the engines.A.less than 25-50%

    B.more than 125-150%

    C.more than 25-50%

    D.less than 125-150%

    According to this passage, which of the following statements is true?

    A.In boiler and machinery spaces, there is the air conditioning

    B.In the boiler rooms the requirement of air volume should meet 25-50% of combustion requirement

    C.To maintain the comfort zone in the separate control room the air conditioning plant should be fitted

    D.The comfort conditions can be maintained in the engine room all the time

    At the middle pressure and large air quantity,_________ is more suitable.A.an axial flow fan

    B.a radial flow blower

    C.a centrifugal fan

    D.an auxiliary blower

    请帮忙给出每个问题的正确答案和分析，谢谢！


    问题 1 答案解析：D


    问题 2 答案解析：B


    问题 3 答案解析：C


    问题 4 答案解析：A

  • 第16题：

    Which statement is TRUE concerning combustible gas indicators ________．

    A.One sample of air is adequate to test a tank

    B.They do not work properly where there is a lack of oxygen

    C.They will detect a lack of oxygen

    D.They are calibrated to read the percentage chance of explosion


    正确答案：B

  • 第17题：

    Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be impracticable to maintain ambient conditions within the comfort zone by air conditioning or any other means. The normal practice is to provide copious mechanical ventilation; in boiler rooms, the quantity is equated to the combustion requirements, while in a motor ship engine room the supply may be 25-50% in excess of the requirements of the engines.

    The axial flow fan is particularly suited to handle these large air volumes at the moderate pressures required, while of course the “straight-through” flow feature places it at an advantage over the centrifugal fan.

    The increasing adoption of automation, with the provision of a separate control room makes less significant the fact that comfort conditions cannot be maintained in the engine room all the time. Which of the following devices should be taken to maintain ambient conditions of the boiler and machinery space?

    A.air compressor

    B.air cooler

    C.air-conditioning plant

    D.mechanical ventilation plant


    正确答案：D

  • 第18题：

    The policeman wrote down all the particulars of the accident.

    A:secrets
    B:details
    C:benefits
    D:words

    答案：B
    解析：

  • 第19题：

    CEA的抗原决定簇中具有交叉反应的是（）

    • A、Gold2～4
    • B、Gold1～3
    • C、Gold5～6
    • D、Gold4～5
    • E、Gold2、Gold4

    正确答案:D

  • 第20题：

    ---Ease to five! ---Reply: Ease to five! ---Report: （）.

    • A、Ease to five
    • B、Port five
    • C、Five
    • D、Yes

    正确答案:B

  • 第21题：

    单选题
    The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.
    A

    large conical springs

    B

    compressed air pressure

    C

    hydraulic pressure

    D

    exhaust gas pressure


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    The _____ of the space shuttle that had exploded in the air were scattered over a large area.
    A

    segments

    B

    fragments

    C

    elements

    D

    ornaments


    正确答案： B
    解析：
    句意：航天飞机在空中爆炸，其碎片分散在很大的一片区域。segment部分；片；段。fragment碎片。element元素；要素；成分。ornament装饰物。

  • 第23题：

    单选题
    Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be （） to maintain ambient conditions within the comfort zone by air conditioning.
    A

    possible

    B

    necessary

    C

    practicable

    D

    impracticable


    正确答案： A
    解析： 暂无解析

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