A.50mmB.18mmC.15mmD.12mm
A.采用直角扣件進(jìn)行搭接 B.采用對(duì)接扣件進(jìn)行對(duì)接 C.錯(cuò)開固定在水平桿上 D.采用旋轉(zhuǎn)扣件固定在剪刀撐上
A.1500mm B.700mm C.650mm D.500mm