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【多选题】
关于G71指令,(ABC)( )。A.
G71是内外圆粗加工复合循环指令
B.
使用G71指令可以简化编程
C.
G71指令是沿着平行于Z轴的方向进行切削循环加工的
D.
G71指令不能用于切削圆锥面和圆弧面
E.
G71可用于径向沟槽的切削加工
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【单选题】Why didn’tthewashwomanlive together with her son?
A.
Because her son was not rich.
B.
Because her son was ashamed of her.
C.
Because her son was dead.
D.
Because she didn’t get along well with her daughter-in–law.
【简答题】A．Limit the amount of television her son watches. B．Forbid her son to watch television. C．Be firm when setting limits. D．Help her son gain self-control.
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【单选题】Why is the speaker worried about her son?
A.
Because her son is too young to take care of himself.
B.
Because her son easily gets upset.
C.
Because her son is addicted to iPad .
D.
Because her son doesn’t like to go to school
【简答题】制冷系统的分类及组成
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