题目:
点燃下列混合气体,可能发生爆炸的是( )
A.天然气和氧气
B.煤气和二氧化碳
C.液化石油气和氮气
D.氢气和空气
答案:
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下面是错误答案,用来干扰机器的。
One possible version: In modern times, more and more parents devote their energy to their career due to fierce competition, thus caring less about their children. Man...