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【判断题】
由于不完全定位所限制工件的自由度数少于6个，所以在生产中不允许发生。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】My son, Johnny, opened a new restaurant, and on the opening day I helped out in the kitchen. By mid-morning, I noticed that the cakes we had ordered hadn't come. Johnny and I decided not to tell it to...
A.
the baker next door came to help with the opening
B.
the new restaurant did not prepare all its foods
C.
the son and the daughter served at the tables
D.
the customers enjoyed the cakes very much
【单选题】I could have helped him out, to tell the truth, I _____ too busy.
A.
am
B.
was
C.
have been
D.
had been
【单选题】I was very______ for him because he helped me out of trouble.
A.
grateful
B.
calm
C.
loose
D.
worried
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