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线段AB长3厘米，绕着它的端点A旋转180度后，这条线段变成了6厘米． （判断对错）
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已知线段AB=8厘米在直线AB上画线段BC=3厘米求线段AC的长．
下列说法中正确的是
两条射线组成的图形叫做角
有公共端点的两条线段组成的图形叫做角
角可以看做是由一条射线绕着它的端点旋转而形成的图形
角可以看做是由一条线段绕着它的端点旋转而形成的图形
已知线段AB=5厘米线段BC=3厘米则线段AC的长为
8厘米
2厘米
2厘米或8厘米
不能确定
已知线段AB的长为10厘米点P是线段AB的黄金分割点那么较长的线段AP的长等于厘米．
一条10厘米长的线段这条线段长分米是1米的．
有四条线段长分别是3厘米5厘米7厘米9厘米如果用这些线段组成三角形可以组成不同的三角形的个数为
5
4
3
2
在长72厘米的一条线段上从左端起先每隔3厘米点一个黄点再每隔4厘米点一个黄点两端都不点在这条线段上
35
38
40
42
如图已知线段AB＝40厘米E.为AB的中点C.在EB上F.为CB的中点且FB＝6厘米求CE的长.
先将线段AB分成20等分线段上的等分点用△标注再将该线段分成21等分等分点用O标注AB两点都不标注现
2460厘米
1050厘米
840厘米
680厘米
已知线段AB=6厘米在直线AB上画线段AC=2厘米则BC的长是
8厘米
4厘米
8厘米或4厘米
不能确定
如图已知线段AB＝40厘米E为AB的中点C在EB上F为CB的中点且FB＝6厘米求CE的长.
数轴上表示整数的点称为整点某数轴的单位长度是1厘米若在这个数轴上随意画出一条长为2004厘米的线段A
2002或2003
2003或2004
2004或2005
2005或2006
有四条线段长分别是3厘米5厘米7厘米9厘米如果用这些线段组成三角形可以组成不同的三角形的个数为.
2个
3个
4个
5个
先画一条射线再从这条射线的端点开始截取一条5厘米长的线段．
先将线段AB分成20等分线段上的等分点用△标注再将该线段分成21等分等分点用○标注AB两点都不标注现
2460厘米
1050厘米
840厘米
680厘米
数轴上表示整数的点称为整点一数轴规定单位长度为1厘米若在这条数轴上随意画出一条10厘米长的线段AB则
8个或9个
9个或10个
11个或12个
10个或11个
已知线段AB=5厘米线段BC=3厘米则线段AC的长为
8厘米
2厘米
2厘米或8厘米
不能确定
数轴上表示整数的点称为整点.某数轴的单位长度是1厘米若在这个数轴上随意画出一条长为2009厘米的线段
2007或2008
2008或2009
2009或2010
2010或2011
已知线段AB的长为10厘米点P.是线段AB的黄金分割点那么较长的线段AP的长等于厘米.
数轴上表示整数的点称为整点某数轴的单位长度是1厘米若在这个数轴上随意画出一条长2018厘米的线段AB
2018或2019
2017或2018
2016或2017
2019或2020
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在水稻生长期施加不同含量的氮肥和硅于高光强大气二氧化碳浓度下测定水稻抽穗期的叶绿素含量光合速率胞间二氧化碳浓度气孔导度实验处理和结果如表． 说明气孔导度指气孔张开程度 根据实验结果可作出的判断是
IwasonceashamedtoadmitmyweaknessbutnowIhavenosuchfeelingandI______myselfmuchdiscomfort. A.grant B.dismiss C.save D.rid
﹣WeallknowfromyoungthatthePrimeMinisterQinhuiintheSongDynastyframedupGeneralYuefeitodeath. ﹣Yes.________. A.Abadbeginningmakesabadending. B.Aguiltyconscienceisaself﹣accuser. C.Abadthingneverdies. D.Amanisknownbythecompanyhekeeps.
2.5分下列实验操作正确的是
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