钢筋在长期受力，长度保持不变的情况下，其应力随时间的增长而降低的现象称为松弛。
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钢筋在承受一定次数的重复周期荷载作用下，突然发生脆性破坏，叫做钢筋的（）
In marine cargo insurance business, general average ().
A. is a kind of partial loss
B. is a total loss
C. sometimes is partial loss and sometimes is total loss
D. is a constructive total loss
According to the "marine cargo insurance clause" of our country, "all risks" includes ().
A. FPA plus 11 general additional risks
B. all risks plus 11 general additional risks
C. W.P.plus 11 general additional risks
D. 11 general additional risks and special additional risks
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