Roman control was only effective in(). ["Scotland","Wales","London","The southeast of Britai"]
典型代表。
焊缝质量检测用5号注射针与压力表相接,用打气筒充气,当压力达时所需压力时,停止充气。一般保持该压力时间不少于(),说明焊接良好。 ["5min","1min","2min","10mi"]
关于螺纹锁紧环换热器的说法,下列选项错误的是() ["可以在线紧固消除内漏","拆装方便,占地面积小","使用时无需维护,信号孔发生泄漏不能在现场处理","热交换效率高"]
()用来度量土工织物抵抗垂直织物平面的法向压力的能力。 ["抗拉强度","撕裂强度","顶破强度","刺破强度"]
依法治国的前提是()。