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【单选题】
自位支承又称浮动支承，在定位过程中随工件定位面的位置变化而自适应，这种支承方式常用于平面定位，其实际限制自由度数通常为（）A.
1个
B.
2个
C.
3个
D.
实际接触点数
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反馈参考答案：
举一反三
【单选题】The mother was afraid to let the boy ______ the tree.
A.
to risk climbing
B.
risk climbing
C.
to risk to climb
D.
risk to climb
【单选题】What can we learn about the dialogue?
A.
The mother was not a good cook.
B.
The boy doesn't like MacDonald.
C.
They sometimes go out for dinner.
【单选题】The mother was nervous because she had not her son who was away at a boarding school.
A.
heard from
B.
heard of
C.
heard about
D.
heard out
【单选题】In the car accident the mother was killed, but her two-year-old son was found_____.
A.
alive
B.
lively
C.
living
D.
live
【简答题】The mother was so sad that she didn't want to say anything.(否定句) The mother was _____ sad _____ say anything.
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