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【单选题】
带射极电阻RE的共射放大电路,去掉并联交流旁路电容CE,后其电压放大倍数( )。A.
减小
B.
增大
C.
不变
D.
变为零
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举一反三
【单选题】Which of the following is a mathematical statement of the first law of thermodynamics?
A.
ΔV = (nR/P)ΔT
B.
ΔE = q + w
C.
ΔH = ΔE + PΔV
D.
ΔG = ΔH – TΔS
【单选题】According to the passage, which of the following is one of the first things to occur when cells are injured?
A.
The flow of electrical impulses through nerve cells at the site of the injury is broken.
B.
The production of substance P traveling through nerve cells to the brain increases.
C.
Endorphins begin to speed up the response of nerve cells at the site of the injury.
D.
A flood of prostaglandins sensitizes nerve endings at the site of the injury.
E.
Nerve cells connected to the spinal cord become electrically quiescent.
【简答题】What is “3P” theory? Which factor is considered first in the “3P” theory when paying bonus?
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