问题
单项选择题
在组合机床上进行深孔钻削时，动力滑台应采用______。
A．一次进给工作循环
B．两次进给工作循环
C．分级进给工作循环
D．反向进给工作循环
答案
参考答案：C
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在组合机床上进行深孔钻削时，动力滑台应采用______。
A．一次进给工作循环
B．两次进给工作循环
C．分级进给工作循环
D．反向进给工作循环
参考答案：C
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Camera was invented by Joseph Nicephore. Niepce in 1827. It's used for taking pictures. There are many great inventions in the world. Here is a short introduction. |