一级理论和二级理论的区别

Ji Zhenping was startled by Ji Feng's words, and quickly said solemnly: "Xiao Feng, you know very well how powerful the weapons of war are now. Warships from both sides are now distributed in various ports, and they are heavily guarded. There are still people at sea." There are a large number of minefields, and special operations are not feasible in such a large-scale war....