A low in a marine weather report is an air pressure system the pressure at the center of which is ______.A.the highest over the areaB.the lowest over the areaC.higher than 1013 HPAD.lower than 1013 HPA

题目

A low in a marine weather report is an air pressure system the pressure at the center of which is ______.

A.the highest over the area

B.the lowest over the area

C.higher than 1013 HPA

D.lower than 1013 HPA

相似考题

1.Forces other than damaging winds are also at work inside tornadoes (龙卷风) . Sometimes,as the wind passes a house, the walls and ceiling burst apart as if a bomb had gone off inside. This explosion is caused by the low air pressure at the center of a tornado.The pressure at the center of a tornado is usually 13 pounds per square inch. However,inside the house the air pressure is normal, about 15 pounds per square inch.The difference of 2 pounds per square inch between the inside and outside pressure may not seem like much. But suppose a tornado passes over a small building that measures 20 by 10 by feet. On each square inch of the building, there is 2 pounds of pressure from the insidethat is not balanced by air pressure outside the building. On the ceiling, that adds up to an unbalanced pressure of 57600 pounds. The pressure of the four walls adds up to 172800 pounds.If windows are open in the building, some of the inside air will rush out through them.This will balance the pressure inside and outside the building.But if the windows are shut tightly, the huge inside pressure may cause the building to burst.Unfortunately, heavy rain often occurs in the storms that later produce tornadoes,so people often shut their windows. This may cause far worse damage later.21、 What did the paragraph before this passage most probably discuss?A、 Measuring rainfall from a stormB、 The kinds of damage caused by explosionsC、 The powerful winds of tornadoes22、 Which of the following is the main topic of the passage?A、 How tornadoes can be preventedB、 When tornadoes usually occurC、 Why tornadoes cause so much damage23、 Tornadoes can destroy buildings because the()A、 force of a tornado increases the air pressure in a buildingB、 air pressure inside a tornado is less than the air pressure inside a buildingC、 air pressure at the center of a tornado is over 172000 pounds24、 What is the difference per square inch between the air pressure inside a building and the air pressure inside a tornado?A、 2 poundsB、 13 poundsC、 15 pounds25、 What would happen if the windows are shut tightly in the stormy weather?A、 Tornadoes may be formedB、 The house may be apartC、 There may not be any pressure inside the building

2.The circulation around a low pressure center in the Northern Hemisphere is ______.A.counterclockwiseB.variableC.clockwiseD.Anticyclonic

3.Low compressor head pressure in a refrigeration system can be caused by ___.A.insufficient condenser cooling waterB.excessive condenser cooling waterC.air in the refrigeration systemD.excessive refrigerant in the system

4.Of the following, which one is not a term of Marine Weather Bulletin?______.A.Complex lowB.DepressionC.High pressureD.Ambient pressure

更多“A low in a marine weather report is an air pressure system the pressure at the center of w ”相关问题

  • 第1题：

    A decrease in barometric pressure is associated with all of the following except ______.

    A.rising warm air

    B.proximity to a low pressure area

    C.inward spiraling circulation

    D.clear dry weather


    正确答案：D

  • 第2题：

    Which general weather conditions should you expect to find in a low pressure system ________．

    A.Fair weather

    B.Precipitation and cloudiness

    C.Scattered clouds at high elevations

    D.Gradual clearing and cooler temperatures


    正确答案：B

  • 第3题：

    If your weather bulletin shows the center of a low pressure area to be 100 miles due east of your position, what winds can you expect in the Northern Hemisphere?______.

    A.East to northeast

    B.East to southeast

    C.North to northwest

    D.South to southeast


    正确答案：C
    假如你的气象报告显示有一低压区域的中心正好在你船位置以东100海里，在北半球你将预计是什么风？北到西北风

  • 第4题：

    单选题
    In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of （）
    A

    broken valve springs

    B

    tight drive belts

    C

    high line voltage

    D

    air in the system


    正确答案： A
    解析： 暂无解析

  • 第5题：

    单选题
    Cast irons weakness in tension and under shock loading limits its use to low pressure steam, air, oil and low speed water fittingsThe above sentence, most probably means （）.
    A

    cast iron has weakness

    B

    cast iron can stand up shock loading

    C

    cast iron fittings are only suitable in low pressure situation

    D

    east iron fittings are not suitable in low pressure situation


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）
    A

    Low compression pressure and high exhaust temperature

    B

    Low firing pressure and high exhaust temperature

    C

    Low compression pressure and low exhaust temperature

    D

    Low firing pressure and low exhaust temperature


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    Which general weather conditions should you expect to find in a low pressure system（）.
    A

    Fair weather

    B

    Precipitation and cloudiness

    C

    Scattered clouds at high elevations

    D

    Gradual clearing and cooler temperatures


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    If your weather bulletin shows the center of a low pressure area to be 100 miles due east of your position，what winds can you expect in the Northern Hemisphere?（）.
    A

    East to northeast

    B

    East to southeast

    C

    North to northwest

    D

    South to southeast


    正确答案： A
    解析： 暂无解析

  • 第9题：

    单选题
    The greater the pressure difference between a high and a low pressure center，the（）.
    A

    dryer the air mass will be

    B

    cooler the temperature will be

    C

    greater the force of the wind will be

    D

    warmer the temperature will be


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    An un-loader is installed on an air compressor to （）.
    A

    bypass the high pressure stage to the low pressure stage on 100% of the air compressors in service

    B

    prevent excessive inter-stage pressure buildup

    C

    control compressor discharge pressure

    D

    remove all but the frictional load during starting


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    An indication of a diesel engine air intake being partially clogged, is （）.
    A

    low firing pressure and low exhaust temperatures

    B

    low firing pressure and normal exhaust temperatures

    C

    high firing pressure and low exhaust temperatures

    D

    high firing pressure and high exhaust temperatures


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    The circulation around a low pressure center in the Northern Hemisphere is（）.
    A

    counterclockwise

    B

    variable

    C

    clockwise

    D

    anticyclonic


    正确答案： B
    解析： 暂无解析

  • 第13题：

    A single barometric pressure reading of 28.60 indicates ______.

    A.rapidly improving weather

    B.deteriorating weather

    C.a severe low pressure system

    D.fair weather and calm


    正确答案：C

  • 第14题：

    If a weather bulletin shows the center of a low pressure system to be 100 miles due east of you, what winds can you expect in the Southern Hemisphere? ______.

    A.South-southwesterly

    B.North-northwesterly

    C.South-southeasterly

    D.North-northeasterly


    正确答案：A
    假如你的气象报告显示有一低压区域的中心正好在你船位置以东100海里，在南半球你将预计是什么风？南到西南风。

  • 第15题：

    单选题
    A marine diesel engine is started by（）
    A

    supplying high pressure oil into a hydraulic motor

    B

    supplying high temperature air into the cylinder

    C

    supplying high pressure air into the cylinder

    D

    electrical igniting


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    Compared to a low pressure system，generally the air in a high is（）.
    A

    warmer，less dense，and less stable

    B

    cool，more dense，and drier

    C

    muggy and cloudy

    D

    extremely moist with high relative humidity


    正确答案： D
    解析： 暂无解析

  • 第17题：

    单选题
    A decrease in barometric pressure is associated with all of the following except（）.
    A

    rising warm air

    B

    proximity to a low pressure area

    C

    inward spiraling circulation

    D

    clear dry weather


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    A single barometric pressure reading of 28.60 indicates（）.
    A

    rapidly improving weather

    B

    deteriorating weather

    C

    a severe low pressure system

    D

    fair weather and calm


    正确答案： A
    解析： 暂无解析

  • 第19题：

    单选题
    The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）
    A

    system is overcharged with refrigerant

    B

    system is low on refrigerant

    C

    discharge valves are leaking excessively

    D

    discharge valves are leaking slightly


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.
    A

    globe valves

    B

    butterfly valves

    C

    gate valves

    D

    reducing valves


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    The purpose of the refrigeration system low pressure cutout switch is to （）
    A

    protect the compressor from liquid flood back

    B

    protect the compressor from low discharge pressure

    C

    start and stop the compressor upon system demand

    D

    start the compressor after a drop in the evaporator pressure


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    Pump up the starting air reservoirs to their maximum pressure and （）the air reservoirs and air system.
    A

    open

    B

    close

    C

    drain

    D

    vent


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.
    A

    leaky discharge valves on the LP cylinder

    B

    leaky discharge valves on the HP cylinder

    C

    insufficient intercooler cooling

    D

    low ambient air pressure


    正确答案： C
    解析： 暂无解析

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