C. then adding the main materials after the bottommaterials react steadily;
当底料反应平稳后，再加入主料；
2
B firstly adding the bottommaterials for smelting at the initial stage of smelting;
冶炼初期，首先加入底料进行冶炼；
3
Pour the materials onto the base and use the rubber scratch board to make the surface flat and make the bottommaterials permeate into the cement base. Do not leave some areas unpainted.