单排扣件式钢管脚手架用于砌筑工程搭设中操作层小横杆间距应小于（）mm

A.600

B.1000

C.1500

D.1200

A.750

B.1000

C.1200

D.1504

A.750;

B.1000;

C.1200;

D.1500;

A.750mm

B.1000mm

C.1500mm

D.1200mm

双排扣件式钢管脚手架用于砌筑工程搭设，操作层小横杆间距不应大于立杆纵距的()。

A.1 /3

B.1/4

C.1/2

D.1.2倍

A.18

B.20

C.24

D.30

搭设单排扣件式钢管脚手架时,在空心砖墙,1/2 砖墙和柱子上不得搁排木。()

A.24m

B.18m

C.30m

D.50m

A.9

B.14

C.9.6

D.15