咯血病人一般不选用下列哪项药物（）。
A.氯化铵
B.可待因
C.必嗽平
D.咳必清
E.棕色合剂
参考答案：B
中性粒细胞的主要功能是
A．产生抗体 B．产生肝素 C．吞噬外来异物D．参与过敏反应 E．产生慢反应物质
The computers made by our company sell best, but several years ago no one could have imagined the role in the markets that they _________.
A．were playing
B．were to play
C．had played
D．played
