double-line

This paper reviewed the chromosomal engineering in the aspects of double diploid, hetero-additive line, hetero-replacement line, exchange line, monosome one incomplete chromosome systems.

对植物染色工程双二倍、异附加系、异代换系、易位系、单系统进行综述。

The paper discussed the wiring pattern,protection and characteristics of electified section post with double line quadripole wiring.

论述双电气化分区亭的式、保护及其特点。