【单选题】GB 150-1998《钢制压力容器》是中国压力容器方面一部十分重要的()国家标准。
【单选题】在GB150-1998(钢制压力容器》中,低温容器是指()。
【单选题】You'd better not ask him for help. He will not try his best _____he agrees to help you.
【单选题】( )不属于抽烟式自动探火及报警系统的组成部分。
【单选题】—May I ask you some questions? —______. [ ]
【单选题】GB150《钢制压力容器》是中国第一部压力容器标准,现行为( )版。
【单选题】下列标准号的标准名称是:GB150-1998()
【单选题】智能火灾报警系统中报警设备分为自动感应报警设备和手动确认报警设备两种,下列属于手动确认报警设备的是______。
【单选题】You'd better not ask him for help. He will not try his best ___ he agrees to help you.
【单选题】You'd better not ask for help. She will not try her best _____ she agrees to help you.