脚手板伸出横向水平杆的长度应不小于（）㎜。
A、80
B、50
C、100
参考答案：C
I often watch CCTV-9, ________ I have learned a lot of new words and expressions.
A．from which
B．of which
C．to which
D．which
股东权益包括( )。
A．资本公积
B．利润
C．股本
D．盈余公积
