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單項選擇題

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

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單項選擇題

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

單項選擇題

Valve lash, or clearance refers to the （）

A.clearance between the top of the valve stem and the rocker arm
B.compression of the valve springs
C.clearance between the valve seat inserts and the head
D.out of roundness of the fuel injection cams

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