色欲天天人妻无码系列|亚洲1卡2卡三卡4卡|亚洲成a∧人片在线播放|A国产精品一区第二页 ,亚洲欧美精品久久-国内精品伊人久久-美女日批视频在线 ,国产精品亚洲а∨无码播放麻豆-国产在线精品一区二区在

1. What is the cause of shell explosion of batteries? A. : The necessary condition of causing shell explosion of batteries is that batteries are long-lasting by comparison when they encounter electric spark. The theory of battery shell expl..