最大弯矩截面最大拉应力等于最大压应力的条件是截面形状对称于中性轴
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EI是梁的抗弯刚度，提高它的最有效、最合理的方法是采用惯性矩大的截面形状
A. 对
B. 错
In addition to working a full day at his ______ , he has to take care of his family.
A. charge
B. company
C. career
D. cash
The whole composition is good _____ some careless mistakes.
A. except for
B. except that
C. except
D. except from
Airline personnel can buy _____ tickets at reduced prices.
A. bus
B. train
C. flight
D. movie
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