keyed file file access system
hydraulic main water main
main pole and main zero
main road main scheme station
ring main structure of main and auxiliary lines
FDFS File Descriptor File System
file allocation table file system FAT
tape file-to-tape file transfer
(Main spare part processing) craft
1 000 kV main transformer
10CrMo910 main steam pipeline
1-Main Bearing-Pump End
1-Main Bearing-Seal End
220 kV main transformer