單項(xiàng)選擇題

The resistance of a conductor varies （）

A.directly as its length and inversely as its cross-sectional area
B.inversely as its length and directly as its cross-sectional area
C.directly as its length and directly as its cross-sectional area
D.inversely as its length and inversely as its cross-sectional area

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單項(xiàng)選擇題

A switchboard for an AC electrical system requires the use of which of the following devices（）.

A.Frequency meter
B.Ohmmeter
C.Induction voltage regulator
D.Current transformer governor

單項(xiàng)選擇題

The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the （）.

A.bridge control panel
B.disconnect links
C.governor relay box
D.main switchboard

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