今晚的七星彩开奖规律

简介：In the past, in the age of matchlock guns, a qualified musket soldier had to go through more than a dozen procedures, from loading primer, gunpowder, bullet loading to firing, which took a minute. Now the steps have been simplified to five or six steps, and only three steps are required at most. In ten seconds, the efficiency doubled. In other words, the firing efficiency of one cannon soldier was equal to that of two people in the past.