What did he _____ at the meeting? [ ]
A. say
B. speak
C. talk
D. tell
答案：A
绘图题：背画带风扇磨煤机热风干燥的直吹式制粉系统图，标出主要设备的名称。
急性链球菌感染肾炎补体C3及总补体恢复的时间是( )
A．1周以内
B．2周以内
C．以上均非
D．4周后8周以内
E．3周以内
