【单选题】抽查10件产品,设事件A:至少有两件次品,则A的对立事件为( )
【单选题】下列哪种情况,可认为火势已被控制住()
A.
灭火剂已经能够穿入火床并已开始有效地把火床冷却
B.
火的主体已经暗下去;所有火势可能扩散的路线都已经加以检查或保护
【判断题】Sounds are said to be in contrastive distribution if they appear in the same environment.()
【简答题】从100件产品中抽查10件产品,记事件A为“至少3件次品”,则A的对立事件是______.
【单选题】在下列何种情况下,可认为火势已被控制住:
A.
灭火剂正在火床上施放,并己开始有效地把火冷却
【单选题】听力原文:A: About big international issues: what do you see as the most important environmental issues of the moment? B: It’s quite difficult to make a kind of hierarchy of worry here, because so many iss...
【判断题】火的主体已经暗下去,可认为火势已被控制。