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【单选题】
放大器的输入电阻，一般是指从放大器输入端看进去的交流信号等效电阻。下面说法正确的是（ ）。A.
放大器的输入电阻越大越好。
B.
放大器的输入电阻越小越好。
C.
电压放大器的输入电阻越大，其输入的电压信号也越大。
D.
电流放大器的输入电阻越小，其输入的电流信号也越小。
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举一反三
【单选题】The human body can tolerate only a small range of temperature, especially when the per- son is engaged in vigorous activity. Heat reac- tions usually occur when large amounts of water and/or salt are ...
A.
do not sweat.
B.
have no salt in their bodies.
C.
cannot take in water.
D.
have frequent fainting spells.
【单选题】The human body can tolerate only a small range of temperature, especially when the per- son is engaged in vigorous activity. Heat reac- tions usually occur when large amounts of water and/or salt are ...
A.
unconsciousness
B.
profuse sweating
C.
hot, dry skin
D.
a weak pulse
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