一般水压试验的压力是原容器(或管束)额定压力的()
A.1倍
B.1.25倍
C.1.5倍
参考答案:B
人类的起源距今至少已有[ ]
A.300多万年
B.200万年
C.250万年
D.170万年
—My sports shoes are nicer than yours? —Yes, but mine are _____ yours.[ ]
A. comfortable
B. more comfortable
C. the most comfortable
D. as comfortable as