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【单选题】
以下电路中，能稳定静态工作点的是（ ）。A.
固定偏置的共射放大电路
B.
分压式共射放大电路
C.
以上都正确
D.
以上都错误
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【单选题】听力原文：W: I'm going over to see a car someone has for sale With all your experience as a mechanic, I'd appreciate your opinion. M: That was twenty years ago. Cars have changed so much. I'm not sure how ...
A.
He might help the woman much.
B.
The woman shouldn't buy a used car.
C.
He doesn't know a lot about new cars.
D.
The woman is a better mechanic than he is.
【简答题】（2分）化学是研究物质的 、结构、 以及变化规律的科学。
【单选题】What kind of working experience does Betty have?
A.
She has experience in teaching.
B.
She has experience in waiting tables.
C.
She has experience in receiving guests.
【简答题】化学是研究物质的 、 、 、 的科学。物理变化与化学变化的本质区别是 。
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