排水泵站中的格栅起保护水泵的作用,格栅倾斜角度为()。
A.10°~50°
B.20°~40°
C.45°~75°
D.25°~55°
参考答案:C
---- How long does she read English every day?
---- She ______ half an hour _______ English every day.
A.spend, read
B.spends, to read
C.spends, reading
D.spend, reading
小船的使用应该与()相适应。
A、船的大小
B、推进系统
C、天气和时间
D、以上都对