58、疲劳断裂与()循环次数有关。
A.静应力
B.应力
C.变应力
参考答案:B
Athletes compete ________ the others ________a medal in the race.[ ]
A. for, for
B. with, for
C. for, with
D. with, with
挑板式雨篷一般由雨篷板和雨篷梁组成,雨篷板是雨篷梁的支撑。()