单项选择题Emulsion oils and sodium nitrite are both approved additives, but () cannot be used if any pipes are galvanized or if soldered joints exist.

A.the latter
B.latter
C.former
D.the former


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2.单项选择题Either a low injection pressure or a leakage of piston rings is able to lead ().

A.a high exhaust temperature
B.a high smoky exhaust
C.a high output
D.a high compression

3.单项选择题Each piston stuffing box is provided with two sealing rings and three()

A.packings
B.piston rings
C.distributor rings
D.scraper rings

4.单项选择题Each journal and pin should be examined for () and grooving.

A.bridges
B.recesses
C.rears
D.ridging

5.单项选择题Each cylinder liner on the marine medium speed engines ().

A.is usually cooled by sea water
B.can be replaced when worn out
C.is in direct contact with the water in the bore of the cylinder
D.can t expand when heated

6.单项选择题Each cylinder is closed at the top by a (), made of a special heat-resistant steel.

A.cylinder liner
B.coupling flange
C.cylinder cover
D.piston crown

7.单项选择题Each cylinder has one starting valve which is usually opened by air pressure and closed by ()

A.nuts and bolts
B.new joints
C.spring force
D.sealing rings

10.单项选择题During the suction stroke, the piston is moving ().

A.inwards
B.outwards
C.downwards
D.upwards