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【单选题】
标准型号SQll4-01三球打捞器的接头螺纹是（）。A.
油管螺纹
B.
油管螺纹
C.
螺纹
D.
油管螺纹或螺纹
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皮皮学刷刷变学霸
举一反三
【单选题】In a two-stroke engine the camshaft rotates at____ the engine rotational speed.
A.
half
B.
twice
C.
the same speed as
D.
four times
【单选题】At least ( ) cylinders in a two-stroke engine will be configured to ensure thatthe engine can be started with crankshaft at whatever position
A.
4
B.
6
C.
12
【单选题】Each cylinder in a two stroke cycle engine experiences combustion（）.
A.
once each crankshaft revolution
B.
twice each crankshaft revolution
C.
every other crankshaft revolution
D.
every fourth stroke
【单选题】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
【简答题】的直接导火线是
【单选题】In two-stroke engine the crankshaft is connected with ____ by means of the connecting rod.
A.
the stuffing box
B.
the piston
C.
the crosshead
D.
guide plate
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