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【单选题】
Many people who saw the film were afraid to swim in the sea when they remembered the scenes people were eaten by the shark. [ ]A.
when
B.
on which
C.
at which
D.
where
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反馈参考答案：
举一反三
【简答题】可控硅具有一般整流二极管的（）性外，还具有良好的（）特性。
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