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下列叙述正确的是 ( )。

A、在TN-C-S系统中,保护线和中性线从分开点起不允许再相互连接
B、可以使用蛇皮管、保温管的金属网、薄壁钢管或外皮作接地线或保护线
C、接地制式:发电机或变压器的中性点不与接地装置相连(对地绝缘),或者通过大电阻或大电抗专用设备与接地装置相连,在发生单相接地短路时,其短路电流很小,故义称小电流接地制式
D、用电设备的接地及安全设计,应根据工程的特点、规模、发展规划和地质特点以及操作维护情况合理确定设计方案
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Questions 16to 20arebasedonthefollowingpassage:

Morethan30,000driversandfrontseatpassengersarekilledorseriouslyinjuredeachyear.Atthespeedofonly30milesperhouritisthesameasfallingfromathird-floorwindows.Wearingaseatbeltsaveslives;itreducesyourchanceofdeathorseriousinjurybymorethanhalf.

Thereforedriversorfrontseatpassengersover14inmostvehiclesmustwearaseatbelt.Ifyoudonot,youcouldbefinedupto£50.itwillnotbeuptothedriverstomakesureyouwearyourbelt.Butitwillbethedriver’sresponsibilitytomakesurethatchildrenunder14donotrideinthefrontunlesstheyarewearingaseatbeltofsomekind.

However,youdonothavetowearaseatbeltifyoureversingyourvehicle;oryouaremakingalocaldeliveryorcollectionusingaspecialvehicle;orifyouhaveavalidmedicalcertificatewhichexcusesyoufromwearingit.Makesurethesecircumstancesapplytoyoubeforeyoudecidenottowearyouseatbelt.(76)Rememberyoumaybetakentocourtfornotdoingso,andyoumaybefinedifyoucannotprovetothecourtthatyouhavebeenexcusedfromwearingit.

1.Thistextistakenfrom________.

A)amedicalmagazineB)apolicereport

C)alegaldocumentD)agovernmentinformationbooklet

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A)reducesroadaccidentsbymorethanhalf

B)savesliveswhiledrivingataspeedupto30milesperhour

C)reducesthedeathrateintrafficaccidentsD)savesmorethan15,000liveseachyear

3.Itisthedriver’sresponsibilityto________.

A)makethefrontseatpassengerwearaseatbelt

B)makethefrontseatchildrenunder14wearaseatbelt

C)stopchildrenridinginthefrontseatD)wearaseatbelteachtimehedrives

4.Accordingtothetext,whichofthefollowingpeopleridinginthefrontdosnothavetowearaseatbelt?

A)Someonewhoisbackingintoaparkingspace.

B)Someonewhoispickingupthechildrenfromthelocalschool.

C)Someonewhoisdeliveringinvitationletters.

D)Someonewhoisunder14.

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Weacknowledgedthereceiptofyourletterdated26thSeptember_____connection______theabovesubject.

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