FamousInventionsandTheirInventors X-rayswerediscovere...
問題詳情：FamousInventionsandTheirInventors X-rayswerediscoveredin1895byaGermanprofessor,WilhelmRoentgen.Peopleallovertheworldwereamazedbyhisinvention,theX-raymachine.Thisinventionwassoimportanttha...