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问题
单项选择题
用纵向磨削法磨削外圆,当砂轮主要原因至台肩一边时,要使工作台(),以防出现凸缘或锥度。
A、立即退出
B、停留片刻
C、缓慢移动
答案
参考答案:B
选择题
______ around the Water Cube, we were then taken to see the Beijing National Stadium, known as the Bird's Nest.
A. Having shown
B. To be shown
C. Having been shown
D. To show
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判断题
道路路基、垫层的施工对道路质量关系不大。
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