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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶电气与船舶安全

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

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