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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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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

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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