A、油箱中液位过低B、臂失去平衡C、初始系统压力过高D、液压系统进气
多项选择题喷射混凝土在物理力学性质和围岩支护特性方面具有()等特点。
A、自捣、密贴、柔性B、施工速度快C、施工机械化程度高D、成本低和适用范围广
单项选择题是指人们从事的相对稳定的、有收入的、专门类别的社会劳动。
单项选择题The damaged trucks were in the way,but our driver got______somehow.()
A.overB.rid ofC.roundD.through
单项选择题A deadlock was reached in the negotiations,as neither side would give______the other.()
A.inB.way toC.upD.away
单项选择题I listened to the speech carefully,but still I couldnt take it all______.()
A.forB.inC.awayD.on