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【单选题】
CO2气体保护焊的特点是( )和焊后变形小。A.
焊接成本高、生产率高、抗锈能力较强
B.
焊接成本高、生产率低、抗锈能力较强
C.
焊接成本低、生产率高、抗锈能力较强
D.
焊接成本低、生产率低、抗锈能力较强
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举一反三
【简答题】简述学习动机与学习效果的关系。
【单选题】I think it ___________ high time they ___________ to take you more seriously.
A.
was, began
B.
is, should begin
C.
should be, begin
D.
is, began
【简答题】What’s the most important thing in your life? Do you think about this question? I began to think about it when I was just a little girl. I had a lot of friends and I loved playing with them. So I thou...
【单选题】— _____ do you _____ this movie? — Very exciting. [ ]
A.
How; think of
B.
What; think of
C.
How; think about
D.
What; think about
【判断题】共轭效应通过共轭体系传递,是一种长程的电效应,即其作用强度在共轭体系中几乎不受距离的影响;诱导效应通过σ 键传递,是一种短程的电效应,即其作用强度随距离远离而急剧减弱。
A.
正确
B.
错误
【单选题】It is time we stared to think seriously about the growing shortage of raw materials in the world today and ______ this mad destruction of our environment by our throw-away society.
A.
stop
B.
stopped
C.
to stop
D.
would stop
【单选题】对于平面相接的组合体,下列说法正确的是 。
A.
结合面一定有线隔开
B.
结合面一定没有线隔开
C.
当结合面不平齐时，两者中间有线隔开
D.
当结合面平齐时，两者中间有线隔开
【判断题】共轭效应通过共轭体系传递,是一种长程的电效应,即其作用强度在共轭体系中几乎不受距离的影响;诱导效应通过σ键传递,是一种短程的电效应,即其作用强度随距离增加而急剧减弱。( )
A.
正确
B.
错误
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