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【单选题】
某数控机床运行一个月后,发生Z轴方向加工尺寸不稳定,尺寸超差无规律,CRT及伺服放大器无任何报警,则可判断是由下列( )原因造成的。A.
主轴跳动误差大
B.
Z 轴联轴器联接螺钉松动
C.
加工原点设置错误
D.
编程时Z轴赋值错误
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皮皮学刷刷变学霸
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【简答题】当你 想表达我们打算上歌唱课 时,你这么说: "______________________________________________________ _________________________ ___."
【单选题】“It is not good that the man should be alone; I will make him a helper fit for him.” What does “a helper fit for him” mean here? (Lec.31, 04’33’’)
A.
A wife likes her husband.
B.
A wife loves her husband.
C.
A wife is her husband’s clone.
D.
A wife complements her husband.
【单选题】Woman: Who is Jackie Tow? I have a parcel here for him. Jackie That's me.______ Woman Yes, please put your name here. Jackie Thank you. It must be the new pair of shoes I bought online.
A.
This is the receipt for it.
B.
Do you have the sender’s address?
C.
I have to check the package.
D.
Do I have to sign for it?
【单选题】I _____ here for him for 2 hours, but I still can not see him.
A.
have waited
B.
had waited
C.
have been waiting
D.
will wait
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