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Shutter speed is also called slow shutter. It consists of an automatic shutter and a slow shutter of 1 to 16 seconds.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.千户转而望向杨长帆，你应考么？杨长帆摇头。Reading Yu Xiuhua's "Unreasonable Joy", the words in it are quite fond of, which also arouses many regrets.乃是民妇相信皇上的英明睿智，相信皇上选拔的官员能秉公断案，更相信‘天网恢恢，疏而不漏。　简凡从小在饭店长大，自诩厨中高手，立志子承父业成为“神厨”，被伙伴戏称为“锅哥”。从商学院毕业后在父母安排下到派出所当协警。他凡事总以厨艺为喻，从细微处窥得事物真谛。生性活泼，遇事谨慎，思维敏捷，生活里经常耍一些小聪明，爱情上时常左右摇摆，但心中的正义底线从未打破。在协助侦破一起抢劫案时，市局刑警支队支队长发现他的特质，经过师傅刻意的培养，经历了挫折与考验，终于考上公务员，成长为一名合格刑警，屡破大案，自信中带了些许桀傲、洒脱中又有几分不羁，初具将帅之才。局领导非常赏识他与众不同的胆识，委以重任侦破一起悬案。简凡与警队的战友，为了心中的忠诚与坚守，忍辱负重，不畏艰难，与犯罪嫌疑人进行不屈不挠地艰苦斗争，终于侦破悬案。简凡也对自己的职业做出无悔的选择。一更求粉红订阅。