A ground can be defined as an electric

1、When would you ground an electric hand

When would you ground an electric hand tool?（）AWhen it is a DC machineBWhen it is an AC machineCAny machine that operates on over 100 voltsDOnly when working on wet steel plate

2、Electric generators can be protected a

Electric generators can be protected against overload（）.AWith switchesBWith a governor on the engineCWith fuses or circuit breakersDBy using heavy wire

3、Copper is often used as an electrical

Copper is often used as an electrical conductor because it （）.Ahas high resistance at low temperaturesBhas a highly polished surfaceCis able to pass current with little oppositionDholds insulation together well

4、What is defined as an area outside sea

What is defined as an area outside sea areas A1, A2 and A3?AAOR-EBAOR-WCCoastal and inland watersDA4

5、（）may be defined as a departure withou

（）may be defined as a departure without justification and under no necessity from the proper and usual course of an agreed voyage，whereby the character and the incidents of such voyage are altered.ADeviationBChangeCAlterationDAmendment

6、Any electric motor can be constructed

Any electric motor can be constructed to be（）.Ashort proofBground proofCexplosion proofDoverload proof