细菌的特殊结构不包括（）
A.芽胞
B.中介体
C.荚膜
D.菌毛
E.鞭毛
参考答案：B
_________ his work , he can’t play with his friends.
A．Not finishing
B． Finishing not
C． Not finish
D． Not finished
管道连接主要要求有哪些？
