7个数复式三中三有多少组公式

简介：After several days of ambush, the sergeants were a little tired, not because of physical exertion, but because of the ambush in the mountains and they could not light a fire. Their food was the big cakes they carried with them. They ate for several days in a row, and they were unable to move in the valley. , there are constant mosquitoes at night, so everyone is a little listless.