引起细菌性咽扁桃体炎最主要的致病菌为（）
A.葡萄球菌
B.溶血性链球菌
C.肺炎球菌
D.肺炎杆菌
E.大肠杆菌
参考答案：B
--- Kitty, do you know ______?
---Sure, about forty minutes.
A．when did their class meeting begin.
B．where their class meeting was held
C．how often their class meeting is held
D．how long their class meeting will last
在气动仪表中，节流盲室的作用是（）
A.可调整仪表的零点
B.可调定调节器的微分时间
C.可调整仪表的量程
D.可整定调节器的积分时间
