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【单选题】
普通晶闸管管心具有（ ）PN结。A.
1个
B.
2个
C.
3个
D.
4个
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反馈参考答案：
举一反三
【判断题】when the second world war ended，britain no longer was the largest military power in western europe. ()
A.
正确
B.
错误
【简答题】Everyone asked me how the story ended, but it was __________________ (对我来说同样是个谜) as to them.
【简答题】and the story ended till I got the answer______________
【判断题】The story ended with the talk between John and his parents to show that people gained more than physical damage in the storm.
A.
正确
B.
错误
【简答题】The story ended without any cosmic conclusions.
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