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【单选题】
下面是晶闸管的说法错误的是（）。A.
晶闸管具有单向导电性
B.
当U AK >0，同时在控制极和阴极间加正向触发信号时，晶闸通
C.
当U AK ≤0或使阴极电流减小到维持电流以下时，晶闸断
D.
可以用一个PNP型三极管和一个NPN型三极管连接构成
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反馈参考答案：
举一反三
【单选题】Speaker A: Your son is very hard-working. Speaker B: ________
A.
No, don’t say so.
B.
That’s right.
C.
Thank you.
【单选题】— What do you think of your brother's son? — He _____ be very naughty but at the same time you _____ help liking him. [ ]
A.
will; will
B.
won't; can't
C.
may; may
D.
can; can't
【单选题】— What do you think of your brother's son? — He ____ be very naughty but at the same time you ___ help liking him. [ ]
A.
will; will
B.
may; may
C.
can; can't
D.
won't; can't
【简答题】一般由卧室(与主卫生间)和起居室(与次卫生间)组成,按酒店规定标准配置设备与用品。
【简答题】将军身被坚执锐。（《史记？陈涉》）
【单选题】— How is your son getting along with his work in England? —Well. He’s ___ very easily to the new environments.
A.
adopted
B.
adapted
C.
adjusted
D.
accustomed
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