简介:一、目的发展学生弯道跑和跳跃能力,培养学生的灵敏素质以及团结竞争意识。二、准备平整场地上画一螺旋形跑道,跑道宽为1米(见附图)。三、方法学生分成甲、乙两组。游戏开始,甲组代表由外往里(逆时针)跑,乙组代表则由里往外(顺时针)跑,当两人相遇时,用双脚做“剪子、包子、锤”。败者被罚下,同队队员及时从原出发点出发。胜者继续跑,当两人再相遇时,继续做“剪子、包子、锤”,依次进行,最先攻入对方出发点者则为该队加100分。四、规则(一)跑时不能串线,否则被罚下。(二)被击败者退出后,换同队队员必须从本队原出发点跑方可。(三)若未攻入对方出发点之前,一方所有队员都被击败罚出,则判攻方获胜。剪子、包子、锤@宋文凤$山东省邹平县孙镇中学
简介:AnewapproachtoproducesuperfineWC-Copowderbydirectreductionandcarbonizationisproposed.Water-solublesaltscontainingWandCowereusedasrawmaterials.Tungstenandcobaltoxidepowder(CoWO4/WO3)wasfirstformedbyaspray-pyrolysistechnique,whichwasthenmixedwithcarbonblackandconvertedtoWC-Cocompositepowderat950℃for4hinN2atmosphere.Theresultingpowderhasaparticlesizeof100-300nm.
简介:Wehaveinvestigatedthephysicalproperties,includingthemorphology,texture,adhesionandchemicalquality,ofhigh-frequencychemicalvapourdepositeddiamondcoatingsonWC-6%Cosubstrates,whichwerepre-treatedbyatwo-stepetchingmethod.TheresultsindicatethattheincreasingCocontentfrom0.12to3.05%withintheetchingdepthof5μmcausedamorphologytransformationfromprismdiamondtospheruliticdiamond,andatexturetransformationfroma{111}orientationtoa{110}orientation.TheRamanspectrumshowsthatthespheruliticdiamondfilmcontainsmorenon-diamondphases(graphite,amorphouscarbonanddiamond-likecarbon,etc)andhaslowerchemicalqualitythandiamondfilmsonaWC-6%Cosubstrate.Thediamondcoatinggrainsizesbecameaboutfourtimessmallerwhenthedepositiontemperaturesonthesubstratesurfacewerereducedfrom1000to900℃.Comparedwithspheruliticdiamondfilms,theprismdiamondfilmsexhibitbetteradhesionontheWC-6%Cosubstrate.