下列哪些是船舶的防水抗沉结构？()。①水密舱壁；②双层底；③船体开口的水密装置。
A、①②D
暂无解析
在Photoshop中打印文件时，有关Bleed(出血)的说法正确的是?()
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.
如何才能显示关联菜单（）
天然骨料加工以()为主，人工骨料加工以（）为主。
砖砌体水平缝的砂浆饱满度应不低于（）。
