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【判断题】
公差带代号由基本偏差代号和标准公差等级代号组成。
A.
正确
B.
错误
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参考答案:
举一反三
【单选题】was the first Irish President to visit Queen Elizabeth II.
A.
Eamon de Valera
B.
John Costello
C.
Mary Robinson
D.
Albert Reynolds
【单选题】was the first Irish President to visit Queen Elizabeth II .
A.
Eamon de valera
B.
John Costello
C.
Mary Robinson
D.
Albert Reynolds
【单选题】正弦振荡器中选频网络的作用是( )
A.
产生单一频率的正弦波
B.
提高输出信号的振幅
C.
保证电路起振
D.
保证电路平衡
【单选题】正弦振荡器中选频网络的作用是【 】。
A.
产生单一频率的正弦波
B.
提高输出信号的振幅
C.
稳定输出信号的幅度
D.
以上都对
【单选题】________ nearly all our money, we couldn't afford to stay at a hotel.
A.
Having spent
B.
To spend
C.
Spent
D.
To have spent
【单选题】正弦振荡器中选频网络的作用是:
A.
产生单一频率的正弦波
B.
提高输出信号的振幅
C.
保证电路起振
D.
以上都不对
【单选题】We couldn't afford __ in London. It's too expensive.
A.
to live
B.
living
【单选题】游戏是为未来生活做准备。这是( )的观点。
A.
放松说
B.
成熟说
C.
生活预备说
D.
剩余精力说
【单选题】________ nearly all our money, we couldn't afford to stay at a hotel.
A.
Having spent
B.
To spent
C.
Spent
D.
To have spent
【单选题】It was a great chance we couldn't afford to miss it.
A.
so, that
B.
such, that
C.
so, as
D.
such, as
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