导流隧洞进出口应与上下游水流相衔接,与河道主流的交角以()左右为宜。
A.300
B.450
C.600
参考答案:A
My parents and I are flying to London for a holiday and I’ll_________ the chance to practice my spoken English.
A.come up with
B.make use of
C.get along with
D.get tired of
A.机械的效率越高,做功越多
B.机械的效率越高,做功越快
C.机械的功率越大,做功越多
D.机械的功率越大,做功越快