防止混凝土产生温度裂纹的措施是()。 ["控制温度差","减少边界约束作用","改善混凝土抗裂性能","改进设计构造"]
道路旅游客运《道路运输经营许可证》经营范围可填写下列哪几项?() ["A.县内旅游客运","B.县际旅游客运","C.市际旅游客运","D.省际旅游客运"]
与钢筋焊接质量有关的因素是() ["A、钢材焊接性","B、钢筋直径","C、钢筋级别","D、搭接长度","E、焊接工艺"]
预应力筋张拉时,通常采用超张拉() ["A、0.5%","B、0.3%","C、5%","D、3%","E、10%"]
混凝土振捣密实,施工现场判断经验是() ["A、2分钟","B、混凝土不再下沉","C、表面泛浆","D、无气泡逸出","E、混凝土出现初凝现象"]
当罐笼到位后,把钩工应怎样操作?