扣件式钢管脚手架由底座上皮向上（）mm处，必须设置纵、横向扫地杆，用直角扣件与立柱固定。
A、100
B、200
C、300
D、500
参考答案：B
— It's sunny today. How about going skiing in Ying Yue Park?
— ______! Let's ask the twins to go with us. [ ]
A. Sounds great
B. Best wishes
C. Good luck
D. That's OK
其他材料制盥洗及厨房织物制品
