單項選擇題The lubricating oil is pumped from the drain tank, very often with () in the suction line.

A.a filter
B.a strainer
C.a magnetic filter
D.a fine strainer


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2.單項選擇題The lowest ring of a piston is ().

A.a coil spring
B.a sealing ring
C.an oil distributor ring
D.main seal ring

3.單項選擇題The lower end of each piston rod is reduced in diameter to fit a bore in ().

A.the crosshead
B.the journals of the crosshead
C.the crosshead shoes
D.the guides

4.單項選擇題The lower end of each piston rod is reduced in diameter to fit a bore in (), this being secured to the piston rod by a nut.

A.the crank-web
B.the connecting rod
C.the main bearing
D.the cross-head