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【单选题】
听力原文：W: Dr. Weinstein, should paints let their children watch television or read about the war? M: If parents are going to let their kids mad or watch television coverage of the war, it's important for them to read along and help their kids interpret what they're reading or seeing. Q: What should parents do if their children watch television or read about the war? (17)A.
To encourage them.
B.
To stop them immediately.
C.
To give some explanation.
D.
To leave them alone.
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皮皮学刷刷变学霸
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【多选题】PN结的重要特性是:
A.
体积很小
B.
施加正向电压后,导电性增强,当电压足够大后,相当于导通。
C.
施加反向电压后,导电性变弱,相当于很大的电阻,可以认为截止。
D.
能够发电
【简答题】PN结的重要特性是 。
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