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At that tail of the warhead, the drag armour-piercing firebomb is filled with a drag agent and a fireagent, Under the pressure of propellant propelling warhead, it will spontaneously ignite to produce open flame, So it can break through the oil drum and ignite or detonate the gasoline. However, the old-fashioned traced armour-piercing firebombs have obvious trajectories due to traced light when they are launched. Therefore, it is very easy to expose oneself while pointing targets to friendly forces. Therefore, the new tracer armour-piercing firebombs now equipped all start to burn and emit light only after the projectile flies out of the muzzle for a certain distance (the generally set safe distance is 100 meters, which makes it impossible for the enemy to judge the firing position with tracer ammunition, while targets within 100 meters do not need to be indicated by tracer), The principle is generally to ignite the tracer and combustion agent carried by the projectile by accumulating the heat generated by the warhead's friction with the air after flying for a certain distance to a certain extent.解放前的上海，很多底层人寄居在闻家店，正可谓三教九流，鱼龙混杂。落魄少爷金不换靠妻子卖淫为生；赖皮匠为妻子治病债台高筑；走方卖药的金老头讲义气；巡捕石敢当呆头呆脑；报贩牛三乐天知命。而开店的老板闻太师（石挥 饰）则是八面玲珑、阴险狡诈。老板娘赛观音水性杨花，放浪不羁。她先是与小偷杨七郎（张伐 饰）私通，不想后者竟然爱上了她那善良敦厚的石小妹（周璇 饰）。妒火中烧的赛观音，从此对妹妹百般欺负，并与姘头小方密谋毒死闻太师，卖掉石小妹。而此时，决定重新做人的杨七郎，正准备和石小妹私奔，正撞见告发他与妻子私通的闻太师。两人扭打在一起，闻太师毒发身亡。杨七郎成为嫌疑犯锒铛入狱……本片根据高尔基的话剧《在底层》改编。秦旷把众人的神情看在眼中，受不了她们的暧昧猜测。该剧是讲述开朗活泼的音乐剧演员某一天突然变成飞上枝头变凤凰，嫁给了皇帝，并在皇室里和绝对权力斗争，以大王大妃杀人案为契机，摧毁了皇室并找到了真爱的故事。待看清楚项羽的面容，正是深爱的情郎时，竟然有些不好意思。单是要两位小姐跑单独逃离也不放心。