The biggest heterosis will be obtained by improved the performance of parents' characters in parents' apolegamy.
在亲本选配中，尽量提高双亲性状的表现，以取得较大的杂种优势。
2
B-12 type water solvent lacquer is used to produce coating material. The main procedures such as pre-heating, coating, and drying are explained. Apolegamy of key equipment is introduced.