A.well
B.good
C.excellent
D.respectively
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A.lime
B.frost
C.scale
D.scar
A.scar
B.scale
C.spur
D.bilge
A.continuously
B.regularly
C.constantly
D.period
A.to change the lube oil
B.have the lube oil purified
C.have the lube oil burnt
D.to analyze the lube oil
A.not less than twice
B.greater at least twice than
C.not greater twice than
D.larger three times than
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Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.
The minimum speed an engine must attain before ignition can occur depends upon （）.
Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.
If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.
In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.
The main purpose of the piston oil scraper rings is to （）.
To determine if the lube oil filter elements need changing, （）.
When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.
What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
How many power strokes per crankshaft revolution are there in an eight cylinder, two stroke/cycle diesel engine?（）