There is only one opening here - 优学优考

There is only one opening here for a typist, and quite a few people are competing for the

问题补充： There is only one opening here for a typist, and quite a few people are competing for the .
A. position
B. situation
C. condition
D. state

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正确答案：****

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物体的最大静摩擦力总是与物体的重量成正比的。（）

二级焊缝，用超声波检验每条焊缝长度的

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