单项选择题
In some designs the cylinder oil is timed so that the oil injects only on the （）.
A.piston crown
B.piston groove
C.piston skirt
D.piston ring belt
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相关考题
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单项选择题
In order to inspect both piston and cylinder wall thoroughly, the cylinder cover should be taken off and the piston should be （）.
A.craned out
B.rolled out
C.lifted out
D.turned out -
单项选择题
In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.
A.aluminum-plated
B.bronze-plated
C.zinc-plated
D.chromium-plated -
单项选择题
In order to ensure the safety of the ship and its equipment during UMS operation, certain essential functions （）.
A.must be provided
B.may be provided
C.have provided
D.can be provided
