离心式压缩机正常停机后,润滑油泵和密封油泵必须()。
A.立即停止运转
B.维持运转
C.长时间运转
D.前三项均可
参考答案:B
看图,并根据中文意思完成下面的小短文。
Welcome to my new home. There are three ____________ and a ____________. The ____________
(客厅) is very big. There is a TV, a table, four ____________ (椅子) and a sofa in it. Look at the ____________
(卧室) on the left (在左边). There is a ____________ (床), a shelf, a table and a chair in it.
被尊为世界上的三大宗教是( )
A.基督教佛教伊斯兰教
B.基督教犹太教伊斯兰教
C.基督教犹太教佛教
D.犹太教佛教伊斯兰教