细菌的细胞质膜的（）是区别于其他细胞质膜的一个十分显著的特点。
参考答案：多功能性
The world’s population has grown _____ it was in 1800.
A．six times more than what
B．more than six times what
C．six times more than which
D．more than six times that
铆钉枪有什么特点？
