305的4倍是[ ]
A.1200
B.1220
C.309
答案:B
He got up________ catch the bus.[ ]
A. in order that
B. in order to
C. so that
D. such that
NPT5型空气压缩机的固定机构主要由()和气缸组成。
A、支撑座
B、支架
C、底座
D、机体