矿用通风机的工作效率要求不低于_。
A.50%
B.60%
C.70%
D.80%
参考答案:B
Summer holiday is coming. I'm _____________ to see some friends. [ ]
A. going to
B. gone to
C. will
D. goes to
个人消费额度贷款中,质押额度一般不超过借款人提供的质押权利凭证票面价值的()。
B.70%
C.80%
D.90%