将蝶形引入光缆牵引出管孔后，应分别用手和眼睛确认光缆引出段上是否有凹陷或损伤，如果有损伤，则重新牵引。
参考答案：对
The Great Wall is ____ tourist attraction that millions of people pour in every year. [ ]
A. so a well-known
B. a so well-known
C. such well-known
D. such a well-known
以下所列各项属于命令按钮事件的是______。
A．Parent
B．This
C．ThisForm
D．Click
