WASHINGTON,March13—When17-year-oldMaryMastermansetoutto...
问题详情：WASHINGTON,March13—When17-year-oldMaryMastermansetouttobuildaspectrograph（摄谱仪）,sheknewitwouldbenoeasytask.Thedevice,aninstrumentusedtoidentifycharacteristicsofdifferentkindsofmolecules,canco...