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If an operating auxiliary boiler has a water pH reading of 7, you should （）.

A.bottom blow the boiler
B.treat the water with caustic soda
C.treat the water with chemical scavengers
D.reduce the water alkalinity to recommended readings

單項選擇題

Generating tubes in waste heat boilers are finned to （）.

A.reduce gas flow turbulence
B.prevent exhaust gas corrosion
C.increase the rate of combustion
D.increase the rate of heat transfer

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Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.

你可能感興趣的試題

If an operating auxiliary boiler has a water pH reading of 7, you should （）.

Generating tubes in waste heat boilers are finned to （）.