发动机过冷可能导致的危害是（）
A.降低充气效率
B.早燃和爆燃倾向加大
C.零件机械性能降低
D.汽油机可燃混合气形成条件变差
参考答案：D
More policemen were sent to Haiti they could help people after the earthquake. [ ]
A. in order to
B. so that
C. because of
便血鲜红，大便不畅或稀溏，腹痛，口苦，苔黄腻，脉濡数。宜用何治法以凉血止血（）
A．清热泻火
B．滋阴降火
C．清化湿热
D．泻肝清胃
