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單項(xiàng)選擇題

It is well known that the whole power distribution of the ship’s electrical services mainly depend on the（）.

A.sub-boards
B.main switchboards
C.emergency switchboards
D.distribution boards

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單項(xiàng)選擇題

How do you treat someone suffering from electrical shock after you secure the source?（）

A.check for respiration
B.check for pulse
C.treat for shock
D.All of the above

單項(xiàng)選擇題

Tools with （）handles should be used to check electric circuit.

A.plastic
B.metal
C.stainless steel
D.copper

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