水位变化区域的外部混凝土、建筑物的溢流面和经常遭受水流冲刷的混凝土，应避免采用（）。

（）对建设工程项目的安全施工负责。

从事建筑活动的施工企业、勘察单位、监理单位应该具备的条件（）。

Inthepast,operationsweredifficult.Untilthemiddleoftheeighteenfifties,surgerywasverydangerous.Manypatientsdiedaftereventhesmallestoperations.Thiswasbecausebacteriaenteredthecutsinthepatientsbodied’andstartedinfection.Insomecountries,upto90percentofpatientsdiedfrominfectionafteroperations.In1865,however,JosephLister,aBritishsurgeon,foundananswertotheproblem.Heusedan“antisepticduring”andafteroperations.Thiskilledthedangerousbacteriaandmostofhispatientslived.Sincethen,surgeonshaveusedantisepticsinalloperations.SurgeryhasdevelopedinmanyimportantwayssincethedayofJosephLister.Today,whenpatientsgotohospitalforanoperation,theycanexpectthebesttreatment,incleanandhygienicconditions.

33.Operationsweredifficultanddangerousuntil_______.

A.1850

B.themiddleof1850

C.themiddleofthefiftiesoftheeighteenthcentury

D.themiddleofthefiftiesofthenineteenthcentury

34.Inthepassage,surgerymeans__________.

A.Theperformingofanoperation

B.cure

C.treatment

D.medicine

35.Inthepast,upto90percentofpatientsdiedafteroperationsmainlyb

ecause__________.

A.bacteriaenteredthecutsinthepatientsbodies’andinfectiontookplace

B.theconditionsinhospitalswerebad

C.theskillofsurgeonswasnotsogood

D.therewerenogoodmedicineatthattime

36.Whichtopicofthefollowingbestsuitsthepassage?

A.Operationsweredifficultinthepast

B.ThedevotionofJosephListertomedicalscience

C.Surgeryhasbecomesafer

D.Developmentsinsurgery

37.JosephListerwas________.

A.aFrenchman

B.aGerman

C.anEnglishman

D.anAmeric

钢丝绳的安全系数是（）。