A.maintain low pH in the cooling water
B.reduce the cooling water temperature
C.increase cooling water hardness
D.form a protective film on metal surfaces
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A.prolong the ignition delay period
B.ensure the beginning of fuel injection
C.thoroughly utilize the air charge
D.allow controlled fuel combustion
A.deliver proper fuel quantity to the injection nozzle
B.provide rapid fuel injection cutoff
C.control fuel quantity entering the pump body
D.control fuel pressure delivered to the combustion chamber
A.of a material harder than the cylinder liner
B.properly lubricated
C.prevented from compressing
D.prevented from rotating during engine operation
A.pre-injection fuel oil treatment
B.lube oil filtration
C.lube oil purification
D.piston cooling
A.their free-floating design
B.their relatively small size
C.the reciprocating motion of the piston
D.their position in the lubrication system
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The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.
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（） is not installed on the main switchboar.
Flame failure in an automatically fired auxiliary boiler can from a/an （）
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One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
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