A microscope is a useful instrument for observing 阅读理解答案.docx
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A microscope is a useful instrument for observing 阅读理解答案.docx
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Amicroscopeisausefulinstrumentfor
observing阅读理解答案
Amicroscopeisausefulinstrumentforobservingsmallobjects.Byproducingabiggerimage,themicroscoperevealsdetailsthatareundetectabletothenakedeye(裸眼).
Beforeusingthemicroscope,pleasereadtheinstructionsbelow.
CAUTION:
Microscopesarebothdelicateandexpensiveandmustbehandledwithcare.
1.Alwayscarrythemicroscopewithtwohands——onesupportingthebaseandtheotheronthearm.
2.Avoidstretchingthewireofthelampacrossawalkway
3.Keepthestagecleanandalwaysuseaglassslideforspecimens(样本).
4.Toavoidcrushingtheglassslidewhenfocusing,beginwiththelensclosetothespecimenandgraduallybackofftofocus.
5.Keepthemicroscopecoveredtopreventthedustwhileitisbeingstored.
HOWTOUSETHEMICROSCOPE:
1.Plug(接通电源)inthelamp.
2.Placeasampleofwhatyouwishtoobserveonaslide.
3.Adjustthemirrorsoitreflectslightfromtheroomupintotheobjectivelens.Whenthemirroriscorrectlyadjusted,acompletecircleoflightwillappearwhenyoulookthroughtheeyepiece.
4.Placeyourslidewiththespecimendirectlyoverthecenteroftheglasscircleonthestage.Ifitisawetslide,besurethebottomoftheslideisdry.
5.WiththeLOWPOWERobjectivelensplacedovertheslide,usethecoarsefocusknobtolowerthelenstothelowestpoint.
6.Lookthroughtheeyepiecewithoneeyewhileclosingtheothereye.Slowlyraisethelensuntilthefocusisrelativelyclear.
7.Usethefinefbcusknobtofine-tune(微调)thefbcus.
8.Withoutchangingthefbcusknobs,switchtotheHIGHPOWERobjectivelens.OnceyouhaveswitchedtoHIGHPOWER,useonlythefinefocusknobtomaketheimagesharper.
50.Whichofthefollowingisthecorrectwaytouseamicroscopeaccordingtothetext
A.Useonehandtocarrythemicroscope
B.Placeasampledirectlyonthecleanstage
C.Whenstored,themicroscopeshouldbeadjusted.
D.Lookthroughtheeyepiecewithoneeye.
51.Ifyouwanttoobserveathinpieceofhair,whichofthefollowingshouldyoudofirst
A.SwitchtoobjectivelensB.Adjustthemirror
C.LookthroughtheeyeD.Placethehaironaglassslide
52.Accordingtothetext,youcouldseeacompletecircleoflight.
A.aftercorrectlyadjustingthemirror
B.whilelookingatthespecimenonaglassslide
C.afterslowlyraisingtheobjectivelens
D.beforepositioningthemirrorcorrectly
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