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问题
单项选择题
X6132型万能铣床主轴上刀换刀时,先将转换开关()扳到断开位置确保主轴不能旋转,然后再上刀换刀。
A、SA1
B、SA2
C、SA3
D、SA4
答案
参考答案:
B
选择题
_____ you've got a chance, you might as well make full use of it.
A. Now that
B. After
C. Although
D. As soon as
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问答题 简答题
为什么树皮类药材多在春、夏时节采收?
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