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【判断题】
晶闸管的内部结构示意图如图所示,P型和N 型半导体组成四层PNPN 结构,形成三个PN 结:J1 、J2 、J3 。由端面N 层半导体引出阴极K,由中间P 层引出控制极K,由端面P 层引出阳极A。所以,晶闸称为四层三端半导体器件。A.
正确
B.
错误
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【单选题】In India, if you cannot use your right hand for the time being,______.
A.
you can pass food with your left hand
B.
you can pass food with the help of your left hand
C.
you'd better not pass food
D.
you'd better leave the table
【简答题】Cultural differences occur wherever you go. When visiting another country, you should be aware of those differences and 1 them. Here are some 2 on how to fit in. Every traveler to a foreign country fe...
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