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【判断题】
包围一点一定有一个单元体，该单元体各面只有正应力而无切应力。( )A.
正确
B.
错误
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举一反三
【单选题】He is said___________a book on the history of Chinese tone bridge , but I don’t know if he has finished it.
A.
to have written
B.
to be writing C . having writing D writing
【单选题】______ he wanted to go out with his friends at the weekend, he had to stay behind to finish his assignment.
A.
Much though
B.
Much as
C.
As much
D.
Though much
【单选题】He______ the work yesterday, but he didn't.
A.
must have finished
B.
need have finished
C.
finished
D.
should have finished
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