单项选择题
A.flame retardant B.moisture resistant C.oil resistant D.low conductivity
（）connectors hold best if a wire is accidentally pulled...
单项选择题（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
A.Ring type B.Fork type C.Spade type D.Push on pull off type
If you must make an electricity connection in a poorly ...
单项选择题If you must make an electricity connection in a poorly accessible spot, solder it and seal it against （）
A.metal B.wood C.water D.plastic
（）is electricity that is flowing where it’s not suppose...
单项选择题（）is electricity that is flowing where it’s not supposed to through water, fittings on your boat, wet wood, damp surfaces, etc.
A.Stray current B.Rated current C.Starting current D.Earth current
