【简答题】他 热衷于 玩游戏 。 ( be big on )
【单选题】离退休综合征的临床表现分为两大类,一个是( ),一个是躯体症状
【单选题】The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the ()
A.
expansion of the combustion gases
B.
exhaust and intake valves just closing
C.
maximum compression is just being attained
D.
fuel injection occurring at that point and combustion begins
【单选题】Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will()