【单选题】某大体积混凝土采用全面分层法连续浇筑时,混凝土初凝时间为180min,运输时间为30min。已知上午8时开始浇筑第一层混凝土,那么最晚可以在上午( )开始浇筑第二层混凝土。
【单选题】He is so addicted to alcohol that _____ seems to be no chance of talking him into quitting. [ ]
【单选题】.He is so addicted to computer games that_______seems to be no chance of talking him into quitting.
【单选题】某大体积混凝土采用全面分层法连续浇筑时,混凝土初凝时间为180min,运输时间为30min。已知上午8时开始浇筑第一层混凝土,那么最晚可以在上午( )开始浇筑第二层混凝土。