沪粤版八年级上册物理知识点(已完结)

19mcm.mm,dm,um,kmsh.min,skmmmmumnmmdmcmmm10310:VVV15C340m/s1500m/s2600m/s3230m/s3320m/s4800m/s5200m/s2020000Hz85Hz1100Hz20000Hz20Hz50dB,70dB,90dBBCC=3.0108m/s1666C=3.0108m/s=UVf0C100C0C100C1001C118-18C=m/vgkgmgt1t=1103kg;1kg=1103g,1g=1103mgKg/m3g/cm3;1g/cm3=1103kg/m3,=1.0103kg/m3=m/vm=vv=m/pmmVv