單項選擇題Wires should have each feature of the following except （）
A.flame retardant
B.moisture resistant
C.oil resistant
D.low conductivity
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1.單項選擇題（）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
2.單項選擇題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
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