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【单选题】
晶体管中的“β”参数是( )。
A.
电压放大系数
B.
基极注入电流大小
C.
电流放大系数
D.
电压放大倍数的大小
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【简答题】Paul is never quiet ,he can-t stop__ t _________.
【单选题】下列旅游事故不属于旅游安全事故的是( _______ )。
A.
交通事故
B.
治安事故
C.
游客食物中毒
D.
航班因天气原因取消
【单选题】He’s never been to the Great Wall, _______?
A.
is he
B.
isn’t he
C.
hasn’t he
D.
has he
【单选题】He's never been to Japan, _____? [     ]
A.
is he
B.
has he
C.
isn't he
D.
hasn't he
【单选题】--He’s never late for school, __________? --Yes, he is.
A.
isn’t he            
B.
is he                 
C.
doesn’t he
【单选题】从a粒子散射实验结果出发推出的下述结论中正确的是 ( )
A.
说明a粒子的速度很大
B.
说明a粒子的质量比金原子质量还大
C.
说明金原子的内部大部分是空的
D.
说明金原子也是个球体
【单选题】He never tells a lie, ______ he?
A.
doesn't he
B.
does he
C.
isn't
【单选题】He's never been to a foreign country, ________? [     ]
A.
isn't he
B.
is he
C.
has he
D.
hasn't he
【单选题】He's never late for class, ________? [     ]
A.
is he
B.
has he
C.
isn't he
D.
hasn't he
【简答题】影响切削温度的因素有哪些?
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