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單項(xiàng)選擇題

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 （）.

A.clearance
B.crush
C.pitch
D.thrust

單項(xiàng)選擇題

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

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