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- For one or two types of engine， the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.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
- 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
- The purpose of the engine's cooling system is to remove excess heat from the engine, to keep the engine operating at its most efficient temperature,and to get the engine up to the correct temperature as soon as possible after starting.