老师一边讲课一边在黑板上写字

该剧描述了“十八大”以来，以“中国制造”和“中国创造”为轴心，中国潮流能发展过程中的科学成就，以及后工业时代，制造业的转型与发展，全面揭示了中国从富起来，到强起来的发展历程。"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.放下茶杯，沥海主宰者的声音不期而至。不忙，我们一点也不忙。"Lack" of Natural Talent//273Covering theory: Covering protection effect. Flame retardants such as boric acid melt at high temperature to form a glassy protective film. On the one hand, it blocks the entry of external oxygen; On the other hand, it diffuses tissue combustible gas to the outside to achieve the covering protection effect on fibers.