Eachtunnelisroughlyroundandthelowerpartofthetunnelissomewhatflat.Thesurfaceoftheroadliesonthebase,whichismadeofconcreteandsteel.Thedrainagesystem(排水系统),justbelowtheroadsurfaceononeside,remo
Eachtunnelisroughlyroundandthelowerpartof
thetunnelissomewhatflat.Thesurfaceoftheroadlies
onthebase,whichismadeofconcreteandsteel.The
drainagesystem(排水系统),justbelowtheroadsurface
ononeside,removesanyextraliquid,particularlywater.
Intheeventoffire,thefiremain,whichismadeofsteel,
pipeswatertomanyfirehydrantstationsatregularintervals
alongthelengthofthetunnel.Thefiremainisatthesideofthetunnel,andattheleveloftheroadsurface.
Othersystemsinthetunnelwillincludeemergencyphones.1.Eachofthetunnelsunderconstructionis_____.A.eightkilometerslongandtwentymetreswide
B.eightkilometerslongandsixmetreswide
C.fourkilometerslongandtwentymetreswide
D.fourkilometerslongandsixmetreswide2.Whichpartofthetunnelinthediagramisusedtopipeoutextrawater?A.1.
B.3.
C.5.
D.6.3.Drivinginthetunnel,onecanknowthetrafficconditionsaheadthrough_____.A.thelights
B.theelectronicsigns
C.thetrucksandcars
D.theemergencyphones4.Thepassageismainlyabout_____.A.theconstructionofaroad
B.thedesignofaroad
C.theconstructionoftwotunnels
D.thedesignoftwotunnels