下列与细菌动力观察有关的是()
A．压滴法标本观测
B．鞭毛染色
C．半固体穿刺
D．革兰染色
E．悬滴标本镜检
参考答案：A, B, C, E
The flowers were so lovely that they in no time.[ ]
A. sold
B. had been sold
C. were sold
D. would sell
C3，C4的含量必须要在（）g/m3以上才能称为富气。
A.100
B.150
C.200
D.以上均错
