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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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單項選擇題

（）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

單項選擇題

During steering gear test should be moved through its full travel in both directions（）

A.pump
B.the cylinder
C.the hunting gear
D.the rudder