数控机床主传动系统是将主轴电动机动力变成切削加工用的切削力矩和切削速度。
A. 对
B. 错
数控车床模拟主轴系统，主轴可以正转，但是不能反转，分析可能的故障原因，并列出排查方法。
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A. Call the secretary again at 10 today.
B. Make another appointment.
Cancel the meeting with the secretary.
D. Express his thanks for the call.
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A. she will buy another caculator.
B. She wants the man to buy a calculator.
C. She will give the man a calculator for a coffee.
D. She wants to invite the man for a coffee.
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