A.鎳絲、鋁絲 B.銅絲、鎳絲 C.銅絲、鉬絲 D.鉬絲、鋁絲
A.10-6~10-7 B.0.01~0.1 C.1~10 D.10-9~10-10
A.0.01~0.04mm/r B.0.04~0.08mm/r C.0.08~0.12mm/r D.0.12~0.16mm/r