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【多选题】
下列关于发动机润滑系统的说法,正确的是( )。A.
曲轴主轴承是采用压力润滑
B.
配气机构的凸轮是采用飞溅润滑
C.
发动机的水泵和发电机轴承采用润滑脂润滑
D.
VE型喷油泵是采用机油润滑
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举一反三
【单选题】They happened to ______for Tianjin when we got there.
A.
leave
B.
have left
C.
leaving
D.
had left
【单选题】They us willingly but they happened to be short of hands, too.
A.
would help
B.
would have helped
C.
were going to help
D.
must have helped
【单选题】They _____ us willingly but that they happened to be short of hands, too.
A.
would help
B.
would have helped
C.
were going to help
D.
must have helped
【单选题】They______ us willingly but that they happened to be short of hands, too.
A.
would help
B.
would have helped
C.
were going to help
D.
must have helped
【判断题】The narrator met Dacre when they happened to be conducting researcher in the same room in the British Museum.
A.
正确
B.
错误
【单选题】They happened to__________ for Tianjin when we got there.A.leaveB.have left###SX
A.
They happened to__________ for Tianjin when we got there. A.leave
B.
have left
C.
leaving
D.
had left
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