隔膜计量泵利用调节机构来调节所输送介质的（）。
A、温度
B、性能
C、流量
D、粘度
参考答案：C
导致龋齿的细菌，主要是（）。
A.乳酸杆菌
B.双歧杆菌
C.葡萄球菌
D.变形链球菌
E.放线菌菌株
_______ , my deskmate and I were born on the same day and same year, so we have a lot in
common. [ ]
A. By accident
B. By chance
C. By coincidence
D. By misadventure
