如图所示构件I-I截面上的内力大小为( )。
参考答案:D
31. Hurry up! By the time we get to the church, the marriage service _____.
A.had started
B.will have started
C.has started
D.must have started
相应水位法由上断面洪峰水位预报下断面洪峰水位,预见期为两断面间的()。
A.洪水传播时间,
B.洪峰传播时间,
C.河槽汇流时间,
D.任意两相应水位的传播时间。