单项选择题
A.piston crown B.piston groove C.piston skirt D.piston ring belt
In order to inspect both piston and cylinder wall thoro...
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
In order to increase the wearing resistance, the cylind...
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
In order to ensure the safety of the ship and its equip...
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
