（） is used for cylinder and cylinder head, the salt water

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[单选题]（） is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.

A. The fuel oil
B. The lube oil
C. The sea water
D. The fresh water

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[单选题]（） supplies pilot air to control the cylinder air start valves.

A. An air compressor
B. An indicator cock
C. An air distributor
D. A safety valve

[单选题]To counteract these undesirable effects cylinder oils usually contain additives formulated to impart a high degree of （） and detergency.

A. salinity
B. alkalinity
C. acid
D. sanitary

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