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名词解释题
接地线（earthing conductor）
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Conductor: Good morning, , please?Passenger: Here you are.A． can I have your ticketB． anything to declareC． can I help youD． anything special
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()is the boy who feels that Christmas doesn't work out for him.A、BillyB、JohnC、the hero boyD、the Conductor
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I love traveling in the countryside, but I don't like losing my way. I went on a trip recently, but my trip took me longer than I expecteD."I'm going to Woodford Green," I said to the conductor as I got on the bus, "but I don't know where it is.""I'll tell you where to get off," answered the conductor.I sat in the front of the bus to get a good view of the countryside. After some time, the bus stoppeD.Looking around, I realized with a shock that I was the only passenger left on the bus."You'll have to get off here," the conductor saiD."This is as far as we go.""Is this Woodford Green?" I askeD."Oh, dear," said the conductor suddenly. "I forgot to put you off.""It doesn't matter," I saiD."I'll get off here.""We are going back now," said the conductor."Well, in that case, I would prefer to stay on the bus," I answereD.1. The conductor ________.：A.got angry when he found out the author was still on the busB.wanted to make a joke with the authorC.was rude to the author at firstD.forgot to tell the author where to get off the bus
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What is the BEST conductor of electricity?A.Carbon dioxideB.Distilled waterC.Fresh waterD.Salt water
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（）是指一建筑物接至接地装置的所有互相连接的金属装置，包括防雷装置。A、接地线earth conductorB、共用接地系统common earthing systemC、接地基准点earthing reference point，ERPD、等电位连接
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（）是指一系统的等电位连接网络与共用接地系统之间唯一的那一连接点。A、接地线earth conductorB、共用接地系统common earthing systemC、接地基准点earthing reference point，ERPD、等电位连接
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（）是指从引下线断接卡或换线处至接地体的连接导体；或从接地端于、等电位连接带至接地装置的连接导体。A、接地线earth conductorB、共用接地系统common earthing systemC、接地基准点earthing reference point，ERPD、等电位连接
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（）是指将分开的设备各导电部分用等电位连接带、等电位连接导体或电涌保护器连接起来，以减少雷电流在他们之间产生的电位差。A、接地线earth conductorB、共用接地系统common earthing systemC、接地基准点earthing reference point，ERPD、等电位连接
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单选题The height of a VHF radio antenna is more important than the power output wattage of the radio because（）.A
VHF communications are basically line of sightB
the air is more dense the higher you goC
salt water is a poor conductor of soundD
sea water absorbs the radiated energy
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单选题What is the BEST conductor of electricity（）.A
Carbon dioxideB
Distilled waterC
Fresh waterD
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单选题Since fuse elements are made of zinc or any alloy of tin and lead, the melting point of the fuse element must be （）.A
higher than that of copperB
lower than that of copperC
equal to that of copperD
reached when the conductor it is protecting becomes white hot
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单选题Copper is often used as an electrical conductor because it （）.A
has high resistance at low temperaturesB
has a highly polished surfaceC
is able to pass current with little oppositionD
holds insulation together well
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名词解释题联结线（bonding conductor）
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