單項選擇題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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1.單項選擇題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
2.單項選擇題Tools with （）handles should be used to check electric circuit.
A.plastic
B.metal
C.stainless steel
D.copper
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