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问题
单项选择题
型腔电火花加工的特点有()
A、电极损耗小
B、蚀除量小
C、电火花加工时,排屑较易
答案
参考答案:A
选择题
Several months ago I was a ______ here and I didn't know anyone.
A. cyclist
B. policeman
C. passenger
D. stranger
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填空题
蒸汽吹扫结束后,应打开所有()和(),排净设备和管线内存水。
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