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Insulator
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单选题Why did the electric fence fail? It is because of _____.A
The deer are smartB
The winter is coldC
The fence is of low qualityD
Snowpack serves as an insulator
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单选题In order to prevent galvanic corrosion，an aluminum boat must be insulated from the davits and gripes. Which of the following is acceptable as an insulator?（）A
Hard rubberB
CanvasC
LeatherD
Sponge rubber
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名词解释题insulator隔离子
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