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The depth of V-groove of 1.6 mm thick printed board shall be 1/3 of the board thickness on both sides of the board.Setting position, dry powder storage tank position and dry powder fire extinguishing system diagram.《少年的秘密日记》是综艺《少年可期》的个人单线版。通过记录拜师途中的生活花絮，以少年嘉宾的个人视角讲述学习和生活中的趣味、细节、悄悄话和搞怪日常。"I remember we had a very clear division of tactics at that time, First, adjust all the automatic rifles in hand to semi-automatic shooting mode, Of the 15 men, apart from the gunners and the bazookas, Most of the others use '81 bars', There are also a small number of 63 types, I'm using the 63, One of the characteristics of this gun and the 81-bar is that the single shot accuracy is especially good, Even better than '56 and a half', Much better than 56 Chong and some Mao Zi guns captured from the Vietnamese, At that time, in order to give full play to this advantage in precision, The company commander ordered us to use this tactic, The concrete implementation is to use heavy machine guns to suppress fire in hidden places, In addition to killing as many enemies as possible, If the enemy takes tactical actions such as lying down to avoid shooting, Then use machine gun fire to limit its movement range, That is to say, they are suppressed in situ, and then rifles are used to give full play to the advantage of high semi-automatic shooting accuracy, giving them "roll call" one shot at a time. This tactic is still very effective in dealing with the first and second large-scale attacks, with extremely high efficiency, and almost all the Vietnamese troops who came up were killed on the way to attack.1. Credibility of information sources