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单选题
Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）
A
Flash point improvers
B
Pour point improvers
C
Inhibitors
D
Foam suppressors
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单选题Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.A
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单选题There will usually be summaries or daily account tables for heavy oil, diesel oil, lubricating oil, and fresh water, which will be compiled（）A
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单选题Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）A
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Except forB
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ExceptD
In addition to
考题
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单选题In some modern large diesel engines, which of the following is used as the support for the main bearings?（）A
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BlockC
BaseD
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main bearingsB
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piston pin bushingsD
All of the above
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