钢丝绳的安全系数是（）。

项目开工前，对施工现场形象进行规划、管理，达到安全文明施工工地标准属于专职安全生产管理人员的职责。

钢筋冷拉应力控制法的实质是（）。

Directions:

Thissectionistotestyourabilitytounderstandshortdialogues.Thereare5recordeddialoguesinit.Aftereachdialogue,thereisarecordedquestion.Boththedialoguesandquestionswillbespokenonlyonce.Whenyouhearaquestion,youshoulddecideonthecorrectanswerfromthe4choicesmarkedA,B,CandDgiveninyourtestpaper.ThenyoushouldmarkthecorrespondingletterontheAnswerSheetwithasinglelinethroughthecenter.

1、A.Thereisnopaper.

B.Themancanusetheprinter.

C.Theprinterdoesn'twork.

D.Themanhastopayfirst.

2、A.Hehasgotanewjob.

B.Hehasgotapayrise.

C.Hehasbeenpromoted.

D.Hehasboughtanapartment.

3、A.Sellacar.

B.Rentacar.

C.Repairacar.

D.Buyausedcar.

4、A.Hedoesn'tlikethecolor.

B.Hedoesn'tlikethestyle.

C.Itistoosmall.

D.Itisofpoorquality.

5、A.Thechiefengineer.

B.Thereceptionist.

C.Theofficesecretary.

D.Thesalesmanager.

下面哪些是图层剪贴路径所具有的特征（）