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【单选题】
运用______的组装有定位器，装配时一般不需要划线定位和找正。A.
自由
B.
简单胎型
C.
复杂胎型
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举一反三
【单选题】– How long have you been collecting stamps? – Ever ______ I was twelve. I have been collecting stamps for about eight years.
A.
since
B.
before
C.
by
【简答题】I have been working for months to ______ a way of solving this problem，but as yet I have not been successful． 我已经工作了几个月想找出解决问题的方法，但是到目前为止还没有成功。
【简答题】At that moment, with the crowed watching me, I was not afraid in the ordinary sense, as I __if I___alone. Awould have been...had been Bshould be...had been Ccould be ...were Dmight have been...were
【单选题】Now I get the telegram I _______.
A.
have been expected to
B.
expected
C.
have been expecting
D.
am expected to
【单选题】_______ your advice, I would have been caught in the traffic and I wouldn't have been there on time. [ ]
A.
In spite of
B.
But for
C.
Because of
D.
As for
【单选题】______more time, I might have been abroad to spend my holiday.
A.
I have been given
B.
I were given
C.
Had I been given
D.
Had I given
【判断题】I would have told him the answer had it been possible, but I have been so busy then.()
A.
正确
B.
错误
【单选题】---How long have you been studying at this school? --- I have been studying here____.
A.
since I was thirteen years old
B.
when I was thirteen
C.
at the age of thirteen
D.
after I was thirteen
【简答题】下图(a)所示是一个反相输入的加法器电路。已知R 11 =R 12 =R f 。如果u i1 ，u i2 的波形如图(b)所示，试画出输出电压u o 的波形。
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