钢丝绳理论重量表演示教学.doc

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1、精品好文档，推荐学习交流钢丝绳理论重量表钢丝绳公称直径(mm)钢丝绳近似重量kg/100m钢丝绳公称抗拉强度14701570167017701870钢丝绳最小破断力天然纤维芯钢丝绳合成纤维芯钢丝绳钢芯钢丝绳纤维芯钢丝绳钢芯钢丝绳纤维芯钢丝绳钢芯钢丝绳纤维芯钢丝绳钢芯钢丝绳纤维芯钢丝绳钢芯钢丝绳纤维芯钢丝绳钢芯钢丝绳613.3013.0014.6017.4018.8018.6020.1019.8021.4021.0022.6033.2023.90718.1017.6019.9023.7025.6025.3027.

2、3027.0029.1028.6030.8030.2032.60823.6023.0025.9031.0033.4033.1035.7035.2038.0037.3040.3039.4042.60929.9029.1032.8039.2042.3041.9045.2044.6048.1047.3051.0049.9053.901034.6033.7038.1045.1048.8048.1052.1051.2055.4054.3058.7057.4062.001141.9040.8046.1054.6059.00

3、58.3063.0062.0067.0065.7071.1069.4075.101249.8048.5054.9064.9070.2069.4075.0073.8079.8078.2084.6082.6089.401358.5057.0064.4076.2082.4081.4088.0086.6093.7091.8099.3097.00104.001467.8066.1074.7088.4095.6094.40102.00100.00108.00106.00115.00112.00121.001688.6086

4、.3097.50115.00124.00123.00133.00131.00141.00139.00150.00146.00158.0018112.00109.00123.00146.00158.00156.00168.00166.00179.00176.00190.00186.00201.0020138.00135.00152.00180.00195.00192.00208.00205.00221.00217.00235.00229.00248.0022167.00163.00184.00218.00236.

5、00233.00252.00248.00268.00263.00284.00277.00300.0024199.00194.00219.00259.00281.00277.00300.00295.00319.00312.00238.00330.00357.0026234.00228.00258.00305.00329.00325.00352.00346.00374.00367.00397.00388.00419.0028271.00264.00299.00353.00382.00377.00408.00401.

6、00434.00426.00460.00450.00486.0030311.00303.00343.00406.00439.00433.00469.00461.00498.00489.00528.00516.00558.00仅供学习与交流，如有侵权请联系网站删除谢谢3精品好文档，推荐学习交流32354.00345.00390.00462.00499.00493.00533.00524.00567.00556.00601.00587.00635.0034400.00390.00440.00521.00564.00

7、557.00602.00592.00640.00628.00679.00663.00717.0036448.00437.00494.00584.00632.00624.00675.00664.00718.00704.00761.00744.00804.0038500.00487.00550.00651.00704.00695.00752.00740.00800.00784.00848.00828.00896.0040554.00539.00610.00722.00780.00771.00833.00820.00

8、887.00869.00940.00918.00993.00100以内的加法和减法（二）——退位减法教学内容：新人教版二年级数学上册P19例2、例3教学目标：①.使学生理解100以内的两位数退位减法的算理，掌握笔算方法，能正确用竖式计算两位数的退位减法。②.使学生经历探索两位数退位减法笔算方法的过程，体会笔算减法规定从个位减起的合理性。③.培养学生认真审题、仔细计算的良好学习习惯，以及