更多“压比(pressure ratio)”相关问题
  • 第1题:

    儿童妇女比(child-women ratio)


    正确答案: 指0~14岁儿童与15~49岁妇女之比。

  • 第2题:

    滑压运行(sliding-pressure operAtion)


    正确答案: 运行时用改变主蒸汽压力来改变负荷,各调节(控制)阀同步动作均保持在其全开位置上。

  • 第3题:

    The pressure of the hose is too low.()

    • A、压载水压力太低。
    • B、水龙压力太低。
    • C、水龙压力太高。
    • D、压载水压力太高。

    正确答案:B

  • 第4题:

    P/O比(P/O ratio)


    正确答案:在氧化磷酸化中,每1/2O2被还原时形成的ATP的摩尔数。
    电子从NADH传递给O2时,P/O比为3,而电子从FADH2传递给O2时,P/O比为2。

  • 第5题:

    Which of the following is the definition of CAS latency?()

    • A、 CAS latency is the ratio between the column access time and the clock cycle time.
    • B、 CAS latency is the ratio between the row access time and the clock cycle time.
    • C、 CAS latency is the ratio between the column access time and the data burst transfer time.
    • D、 CAS latency is the ratio between the row access time and the data burst transfer time.

    正确答案:A

  • 第6题:

    问答题
    If there are only red, blue, and green marbles in a jar, what is the ratio of red to blue marbles?  (1) The ratio of red to green marbles is 2:3.  (2) The ratio of green to blue marbles is 6:5.

    正确答案: C
    解析:
    题目中含三个未知量,(1)、(2)条件相结合可以计算红色和蓝色珠子的比例,两个条件无法单独决定,故本题选C项。

  • 第7题:

    单选题
    An indicator card or pressure-volume diagram, shows graphically the ()
    A

    compression ratio of the engine

    B

    volume of the engine

    C

    relationships between pressure and volume during one stroke of the engine

    D

    relationships between pressure and volume during one cycle of the engine


    正确答案: D
    解析: 暂无解析

  • 第8题:

    单选题
    The pressure of the hose is too low.()
    A

    压载水压力太低。

    B

    水龙压力太低。

    C

    水龙压力太高。

    D

    压载水压力太高。


    正确答案: D
    解析: 暂无解析

  • 第9题:

    单选题
    Which of the following is the definition of CAS latency?()
    A

     CAS latency is the ratio between the column access time and the clock cycle time.

    B

     CAS latency is the ratio between the row access time and the clock cycle time.

    C

     CAS latency is the ratio between the column access time and the data burst transfer time.

    D

     CAS latency is the ratio between the row access time and the data burst transfer time.


    正确答案: A
    解析: 暂无解析

  • 第10题:

    单选题
    For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?()
    A

    An increase in compression ratio will increase the ignition lag

    B

    An increase in compression ratio will decrease the ignition lag

    C

    A decrease in compression ratio will decrease the ignition lag

    D

    A decrease in ignition lag will increase the compression ratio


    正确答案: C
    解析: 暂无解析

  • 第11题:

    名词解释题
    绿信比(Green Time Ratio)

    正确答案: 绿信比是评价交通控制效率的一个指标,是指有效绿灯时间与周期的比值。
    解析: 暂无解析

  • 第12题:

    单选题
    The ratio of r to s is 3 to 4. The ratio of s to t is 2 to 9. What is the ratio of r to t?
    A

    1 to 3

    B

    1 to 6

    C

    2 to 9

    D

    3to10

    E

    4 to 5


    正确答案: B
    解析:
    根据题干r/s=3/4,s/t= 2/9,所以s=(2t)/9。因为r/s=3/4,r/s=r/{(2t)/9}=3/4,(9r)/(2t)=3/4,所以r/t=(3/4)(2/9)=1/6,故选B。

  • 第13题:

    除氧器滑压运行(sliding pressure operation of deaerator)


    正确答案: 除氧器滑压运行是指除氧器压力随机组负荷的变化而变化的运行方式。

  • 第14题:

    温比(temperature ratio)


    正确答案:透平进口处的温度与压气机进口处的温度之比。

  • 第15题:

    DNB比 DNB ratio(DNBR)


    正确答案: 燃料元件包壳上给定点的偏离泡核沸腾热流密度与实际热流密度之比。

  • 第16题:

    胶体/晶体渗透压(colloid/crystal osmotic pressure)


    正确答案:由血浆中胶体可溶颗粒形成的渗透压。

  • 第17题:

    名词解释题
    胶体/晶体渗透压(colloid/crystal osmotic pressure)

    正确答案: 由血浆中胶体可溶颗粒形成的渗透压。
    解析: 暂无解析

  • 第18题:

    名词解释题
    矢跨比(shi kua bi)rise-span ratio

    正确答案: 拱的矢高f与跨径L之比f/L称为矢跨比,又称矢度。用于表征拱的坦陡程度,它不但影响主拱圈内力,还影响拱桥施工方法的选择,同时影响拱桥与周围景观的协调。一般的矢跨比小于1/5的拱桥称坦拱,大于或等于1/5的称陡拱。
    解析: 暂无解析

  • 第19题:

    名词解释题
    性比(sex ratio)

    正确答案: 是指一个雌雄一体的种群所有个体或某个龄级的个体中雄性对雌性的比率。
    解析: 暂无解析

  • 第20题:

    单选题
    If the compression ratio is increased on any diesel engine, ()
    A

    the expansion ratio will decrease

    B

    combustion will be slowed down

    C

    thermal efficiency will decrease

    D

    thermal efficiency will increase


    正确答案: B
    解析: 暂无解析

  • 第21题:

    单选题
    The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?()
    A

    speed, torque, and horsepower production

    B

    firing order, valve timing, and valve lift

    C

    fuel consumption, efficiency, and cylinder pressure

    D

    scavenge pressure, compression ratio, and exhaust pressure


    正确答案: D
    解析: 暂无解析

  • 第22题:

    单选题
    The ratio of the height of a vessel’s rudder to its width is referred to as the().
    A

    aspect ratio

    B

    constriction ratio

    C

    rudder ratio

    D

    steering ratio


    正确答案: B
    解析: 暂无解析

  • 第23题:

    单选题
    In a fixed displacement axial piston hydraulic motor, the speed is varied by()
    A

    regulating the ratio between torque and speed via the torque limiter at the motor

    B

    directing the motor output flow through a bypass line

    C

    maintaining a constant flow and pressure input

    D

    controlling the input flow rate


    正确答案: C
    解析: 暂无解析

  • 第24题:

    填空题
    The ratio of a to b is the same as the ratio of 1.4 to 7. If a=14, what is the value of b?____

    正确答案: 70
    解析:
    因为a÷b=1.4÷7,当a=14时,经计算b=70。