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【单选题】
电路如图 所示。其中电阻 R=2k W , 硅稳压管 D Z1 、 D Z2 的稳定电压 U Z1 、 U Z2 分别为 6V 和 8V ,正向压降为 0.7V ,动态电阻可以忽略。试求电路输出端 A,B 两端之间电压 U AB 的值。A.
14V
B.
6.7V
C.
8.7V
D.
0V
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举一反三
【单选题】if a speaker uses a simple example of the well-known Golden Gate Bridge when illustrating the topic of suspension bridge, what is his purpose by doing so?
A.
make his speech vivid
B.
make his delivery more touching and powerful
C.
use example to clarify his idea
D.
use example to reinforce his idea
【单选题】在船舶中央空调的夏季降温工况中，保持合适舱室温度的措施中不包括（）。
A.
采用两组或以上的冷剂电磁阀及热力膨胀阀为同一台空冷器供制冷剂
B.
回风温度控制冷剂电磁阀的开闭
C.
根据空冷器中的冷剂蒸发压力对压缩机进行能量调节
D.
采用空气自动加湿环节
【单选题】what is the meaning for phrases "multi-link suspension "?
A.
制动系统管路
B.
专用接头
C.
制动液
D.
多连杆悬架
【单选题】Consider the following experiment. Carefully isolated liver mitochondria are placed in a weakly buffered solution. Malate is added as an energy source, and an increase in oxygen consumption confirms t...
A.
The proton motive force will be reduced to a value of zero.
B.
There will be no change in the proton motive force.
C.
The proton motive force will be increased.
D.
The proton motive force will be decreased but to a value greater than zero.
E.
The proton motive force will be decreased to a value less than zero.
【单选题】A thin rod whose length L is 12.4cm and whose mass m is 135g, suspended at its midpoint from a long wire. Its period T a of angular SHM is to be 2.53s. An irregularly shaped object X is then hung from...
A.
6.12x10 -4 g.m 2
B.
6.12x10 -4 kg.m 2
C.
6.12x10 -5 kg.m 2
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