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问题
填空题
维修轨道时不准（）。
答案
参考答案：单人作业
选择题
The clever boy made a hole in the wall, ______ he could see what it was going on inside the house.
A. on which
B. at which
C. through which
D. in which
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问答题 简答题
3、4号机轴向位移保护定值是多少？
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