单项选择题

If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the _____.
A.trick wheel
B.accumulator
C.standby pump
D.telemotor

A.
A.trick
B.accumulator
C.standby
C.telemotor

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单项选择题

A diesel engine is warmed up and white vapor is in the exhaust，this could indicate ________.
A.excessive cylinder lubrication
B.a lugging engine
C.a leaking cylinder liner
D.overloading of one cylinder

A.
A.excessive
B.a
C.a
D.overloading

单项选择题

在Cl-和CrO4-2浓度皆为0.10mol/L的溶液中逐滴加入AgNO3溶液，情况为( )。(Ksp(AgCl)=1.8×10- 10、Ksp(Ag2CrO4) =2.0×10-12)
A、Ag2CrO4先沉淀
B、AgCl先沉淀
C、同时沉淀
D、都不沉淀

A.10mol/L的溶液中逐滴加入AgNO3溶液，情况为(
B.8×10-
C.0×10-12)