He has been so occupied with his work these days that he barely has time to his friend s. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
visit with
B.
visit on
C.
visit in
D.
visit to
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【简答题】G71的指令格式为:G71 U_ R_; G71 P_ Q_U_W_;其中,第二行的U代表什么?A. 背吃刀量 B. 退刀量 C. X方向的精加工余量 D. Z方向的精加工余量