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【单选题】
由于稳压管的功率较小，且稳压压电路稳定电压是由稳压管的稳压值决定的，所以稳压压电路仅适合（ ）、（ ）的场合。A.
电压较小且变化不大，负载电流固定不变
B.
电压较大，负载电流较大
C.
电压固定不变、负载电流较大
D.
电压固定不变、负载电流较小且变化不大
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举一反三
【简答题】They ___________ (can，go) out because the light’s on.
【单选题】Later, they found it easier to travel because ______.
A.
they could travel by wagons
B.
they could ride on their tame animals and go across water in hollowed tree trunks
C.
the roads were splendid
D.
the climates were favorable
【简答题】果汁的酶法澄清主要使用____酶、____酶和____酶。
【单选题】Our teacher told us that light ______ faster than sound.
A.
travels
B.
travelled
C.
travel
D.
will travel
【单选题】By making us imagine that we travel at the speed of light, the author tries to ________ .
A.
show us how fast we can travel in the universe
B.
give us an idea of how fast light travels
C.
tell us how close the moon and the sun are to us
D.
give us an idea of how big the universe is
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