The cylinder and piston must be warmed up （） to a temperature of about 140 degF in standing by engine.
举一反三
- For one or two types of engine， the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.
- In a four-stroke engine, the cycle of events is completed in four<br/>strokes of(()) A: the cylinder B: the crankshaft C: the piston D: the crosshead
- In four strokes engine, the cycle of events is completed in four<br/>strokes of (). A: the cylinder B: the crankshaft C: the piston D: the cross-head
- After the engine is warmed, we should ()the turning gear before<br/>starting the engine. A: take in B: put in C: take out D: put out
- For any piston ring to operate smoothly without scuffing, the ring must be_______. A: of a material harder than the cylinder line B: properly lubricated C: prevented from compressing D: prevented from rotating during engine operation