闪光焊轨过程中,顶锻开始时对钢轨施加压力的性质是()。
A.静压力
B.冲击压力
C.爆炸力
D.循环力
参考答案:C
The monument was built in honor of the explorer who was believed ________ the big river.
A.to have discovered
B.to have been discovered
C.to discover
D.having been discovered
特别适合高档精毛纺织物织造的织机是()。
A、片梭织机
B、剑杆织机
C、喷气织机
D、喷水织机