能完整地表现出各种生命活动的最微小层次是 [ ]
A．原子
B．分子
C．细胞
D．个体
答案：C
The fans were well behaved,and the game was played without _________.
A．incident
B．accident
C．event
D．matter
简述安装机床地脚螺栓组件的用途和紧固地脚螺栓的注意事项。
