单项选择题

Early models of the flash-type evaporators used a separate shell-and-tube heat exchanger as the air ejector condenser.More recent models use a combined air ejector condenser with the（）

A.distilling condenser
B.salt water feed heater
C.distillate cooler
D.flash chamber

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单项选择题

The second stage feed-water temperature and shell absolute pressure in a multistage, flash type, distilling plant is （）

A.higher than the first stage feed-water temperature and absolute shell pressure
B.lower than the first stage feed-water temperature and absolute shell pressure
C.the same as the first stage feed-water temperature and absolute shell pressure
D.not related to the feed-water temperature and absolute shell pressure

单项选择题

The efficiency of a flash type evaporator can be increased by（）

A.lowering brine discharge density
B.decreasing the absolute pressure of each stage
C.increasing the saltwater feed heater temperature
D.increasing the pressure at the spray pipe

单项选择题

In some modern large diesel engines, which of the following is used as the support for the main bearings?（）

A.Bedplate
B.Block
C.Base
D.Sump