MAG welding MAG焊接

A、 In the EN numerical classification of welding process 131 & 135 represents the MAG welding process.在EN焊接工艺的数字分类中，131和135代表MAG焊接工艺
B、
141 represents the MAG welding process.141代表MAG焊接工艺
C、 121 represents MAG.121代表MAG
D、
None of the above. 以上都不是