劳动功能障碍分为多少个等级（）
A.5
B.8
C.10
D.12
参考答案：C
跨度为l的梯形屋架的起拱高度应为( )
A．l/1000 B．l/500C．l/100 D．l/20
________for her，Chen Zhong，the last champion，had no chance to take part in the finals.
A．Luckily
B．Unfortunately
C．Obviously
D．Absolutely
