A.0.1~0.2B.0.05~0.1C.0.02~0.05D.0.01~0.02
A.感应系仪表B.电动系仪表C.电磁系仪表D.磁电系仪表
A.100~200mTB.200~300mTC.300~400mTD.400~500mT