充油电气设备之间的总油量在()kg且门外为公共走道或其他建筑物的房间时,应采用非燃烧或难燃烧的实体门。
A.>1000
B.>500
C.>200
D.>100
参考答案:D
—How much did they ________ for it?
—I’m sorry I can’t remember ________, but I bought it at sale.
A.pay; for a moment
B.charge; for the moment
C.pay; for the moment
D.charge; for a moment
后弯叶片可以获得(),噪音也较小。