原有的单位要换算成的单位应乘以square inches平方英寸square centimetres平方厘米6.451 6square feet平方英尺square metres平方米0.092 903square yards平方码square metres平方米0.836 13square miles平方英里square kilometres平方公里2.589 99square miles平方英里acre...[继续阅读]

    原有的单位要换算成的单位应乘以cubic inches立方英寸litres升(公升)1.638 71×10-2cubic feet立方英尺litres升28.316 9cubic feet立方英尺cubic metres立方米0.028 32cubic yards立方码cubic metres立方米0.764 56gallons(Brit.)加仑(英)cubic metres立方米4.546 09×10-3li...[继续阅读]

    原有的单位要换算成的单位应乘以pounds磅kilograms千克(公斤)0.453 592pounds磅tons吨4.53592×10-4long hundredweights长担kilograms千克50.802 345short hundredweights短担kilograms千克45.359 237long tons长吨kilograms千克1 016.046 9long tons长吨tons吨1.016 046 9short tons短...[继续阅读]

    原有的单位要换算成的单位应乘以calories卡路里joules焦耳4.186 8calories卡路里kilowatt hours千瓦小时1.163×10-6calories卡路里British thermal units英热单位3.968 31×10-3kilowatt hours千瓦小时joules焦耳3.6×106kilowatt hours千瓦小时calories卡路里8.598 45×105...[继续阅读]

    Derived units are formed by combining base units. Velocity forexample (distance divided by time) has units of metres per second(ms-1 or m/s). Certain units have their own special names andsymbols as shown.导出单位是通过基本单位的组合而形成的。例如速度(距离除以时间)的单位...[继续阅读]

    The units are used with prefixes in front of the word to denotemultiples or submultiples of 10. For instance,centi-indicates 10-2(0.01),so 1 centimetre (1 cm)is 0.01 metre.kilo- denotes 1 000,so 1 kilometre (1 km) is 1 000 metres. Note that the unit of ma...[继续阅读]

    The primary symbols are I1,V5,X10,L50,C100,D500,M1 000.最基本的符号是I,V,X,L,C,D,M,分别表示阿拉伯数字1,5,10,50,100,500,1 000。罗马阿拉伯罗马阿拉伯罗马阿拉伯ⅠⅡⅢⅣⅤⅥⅦⅧⅨⅩXVXIXXXXXVXXIXXXXXXXV1234567891015192025293035LXLXVLXIXLXXLXXVLXXIXLXXXLXXXVLXXXIXX...[继续阅读]

    氢hydrogen(H)铍beryllium(Be)氮nitrogen(N)氖neon(Ne)铝aluminium(Al)硫sulphur(S)钾potassium(K)钛titanium(Ti)锰manganese(Mn)镍nickel(Ni)镓gallium(Ga)硒selenium(Se)铷rubidium(Rb)锆zirconium(Zr)锝technetium(Tc)钯palladium(Pd)铟indium(In)碲tellurium(Te)铯caesium(Cs)铈cerium(Ce)钷pr...[继续阅读]

    APPEND 装入文件命令ASSING 指定驱动器命令ATTRIB 设置文件属性命令BACKUP 后备文件命令BREAK 中断命令CHCP 转换代码页面命令CHDIR (CD) 改变目录命令CHKDSK 检查磁盘命令CLS 清除屏幕命令COMMAND 设命令处理器命令COMP 比较文件命令COPY 复制文件...[继续阅读]

    All specified files are contiguous执行CHKDSK命令。所指定的文件是连续写在磁盘上的。All location error for file,size adjusted执行CHKDSK命令。在文件位置表中发现了一个无效扇区号,该文件从最后一个有效扇区之后被截去。Attempted write protect violat...[继续阅读]