main branch of brachial plexus
main branch of facial nerve
main branch of Haihe River
anchorage length and lap length
ratio of pulse length to the total cycle length
span length of length bar
1 000 kV main transformer
10CrMo910 main steam pipeline
220 kV main transformer
220 kV main transformer protection
Ⅱcross-section main girder
3 main lines of time-cost-innovation
330 kV main transformer
500 kV main electrical connections