單項(xiàng)選擇題

In order to keep the oil film on the cylinder liner during the running-in period, the piston rings are slightly rounded（）

A.on both the external and internal top edges
B.on both the external top and bottom edges
C.on both the external and internal bottom edges
D.on all the four edges

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單項(xiàng)選擇題

In some type of two-stroke engines, besides some small holes for（）, starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the（）

A.fuel valves；exhaust valve
B.exhaust valves；inlet valve
C.fuel valves；inlet valve
D.exhaust valves；fuel valve

單項(xiàng)選擇題

In a two-stroke engine, there are always a series of openings known as （）, and in some circumstances, there are also openings known as （）, in the part of the cylinder liner.

A.scavenging air ports；exhaust ports
B.inlet ports；scavenging air ports
C.scavenging air ports；inlet ports
D.exhaust ports；inlet ports

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In order to keep the oil film on the cylinder liner during the running-in period, the piston rings are slightly rounded（）

你可能感興趣的試題

In some type of two-stroke engines, besides some small holes for（）, starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the（）

In a two-stroke engine, there are always a series of openings known as （）, and in some circumstances, there are also openings known as （）, in the part of the cylinder liner.