船体总纵弯曲形式有静水总纵弯曲和波浪总纵弯曲两种。
参考答案：对
M和N都是非零自然数，而且M=4N，那么M和N的最大公约数是______，最小公倍数是______
A.4 B．M C．N D．MN．
We'll go to visit Tian' an men Square _____ it doesn't rain tomorrow. [ ]
A. if
B. as soon as
C. when
D. since
