满分5 >
初中数学试题 >
如图,某种型号链条每节长为2.5cm,每两节链条相连接部分重叠的网的直径为0.8...
如图,某种型号链条每节长为2.5cm,每两节链条相连接部分重叠的网的直径为0.8cm,则这种链条60节的总长度为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164812469462595/SYS201310221648124694625008_ST/images0.png)
A.150cm
B.104.5cm
C.102.8cm
D.102cm
考点分析:
相关试题推荐
解方程
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164812469462595/SYS201310221648124694625007_ST/0.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164812469462595/SYS201310221648124694625007_ST/1.png)
的结果是( )
A.x=-3
B.x=3
C.x=6
D.无解
查看答案
如图,AB是⊙O的直径,弦CD⊥AB,垂足为点E,AB=10,CD=8,那么AE的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164812469462595/SYS201310221648124694625006_ST/images0.png)
A.2
B.3
C.4
D.5
查看答案
下列几何体中,主视图、左视图、俯视图相同的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164812469462595/SYS201310221648124694625005_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164812469462595/SYS201310221648124694625005_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164812469462595/SYS201310221648124694625005_ST/images2.png)
D.
查看答案
某城市为了解居民用水情况,在某小区随机抽查了20户家庭的月用水量,结果如下表:
则关于这20户家庭的月用水量,下列说法错误的是( )
A.方差是1.5吨
B.中位数是6吨
C.平均数是6.2吨
D.众数是6吨
查看答案
数学课上,老师让同学们观察如图所示的图形,问:它绕着圆心O旋转多少度后和它自身重合?甲同学说:45°;乙同学说:60°;丙同学说:90°;丁同学说:135°.以上四位同学的回答中,错误的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164812469462595/SYS201310221648124694625003_ST/images0.png)
A.甲
B.乙
C.丙
D.丁
查看答案