單項(xiàng)選擇題（）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
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1.單項(xiàng)選擇題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
2.單項(xiàng)選擇題（）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
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