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【判断题】
单元体的主平面上正应力出现极值，切应力为零；最大切应力对应的斜截面上切应力出现极值，正应力等于零。A.
正确
B.
错误
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【单选题】________it is________you obtain, you must tell your parents. [ ]
A.
Whatever; that
B.
No matter what; /
C.
What; that
D.
Whatever; /
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