题型:问答题 简答题 If he ______ it, he _______ it.A.had seen; could have believedB.saw; couldn’t believeC.saw; couldn’t have believedD.has seen; had believed 查看答案
题型:问答题 简答题 承重的满堂红脚手架,立杆的纵、横向间距不得大于( ),纵向水平杆(顺水杆)每步间距离不得大于( )。A.1.3m,1.5mB.1.5m,1.4mC.2.0m,1.7mD.1.2m,1.6m 查看答案