角膜接触镜物像如图放大率为()
A.5%~10%
B.6%~11%
C.7%~12%
D.8%~13%
E.9%~14%
参考答案:C
There are a lot _____ vegetables in the supermarket this week than last week. [ ]
A. of
B. most
C. /
D. more
冷却塔调试的一个关键部位是风机。调试时,应首先将风机与冷却塔壳体紧固好,然后用手盘动(),转动时不允许扇叶和塔体有摩擦。
A.电动机皮带
B.布水器头
C.风机扇叶
D.喷嘴喷头