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【单选题】
指令G53是（）。A.
选择机床坐标系
B.
模态指令
C.
设置机床坐标系
D.
设置工件坐标系
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举一反三
【单选题】--- What are you going to do this evening? --- ___________.
A.
I’m going to meet some friends
B.
I’ve seen a film with some friends
【单选题】You should be more careful, _______ you might meet with some accident.
A.
meanwhile
B.
otherwise
C.
although
D.
however
【单选题】When you meet some trouble about how to use this new kind of machine, you can the instruction.
A.
look for
B.
see
C.
refer to
D.
check
【单选题】— Where did you meet your middle school teacher? — It was in the supermarket ______ I was doing some shopping with my son.
A.
that
B.
where
C.
when
D.
which
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