若喷油器回油管中有机油窜出，表明（）。
A、喷油器压紧螺栓帽松动
B、忘记放密封垫
C、喷油器体上O形圈未装
D、燃油压力低
参考答案：C
. Had I known about this computer program, a huge amount of time and energy __ .
A．would have been saved
B．had been saved
C．will be saved
D．was saved
涩肠止泻宜煨用，敛肺清热、利咽开音宜生用的药物是（）
A.五味子
B.诃子
C.赤石脂
D.椿皮
E.莲子
