单词	research learning
释义	research learning 研究性学习
随便看	helium leak detection mass spectrometer helium leak detector helium leak test helium leak-test Helium leak testing of nuclear fuel rod for PWR helium leak test of titanium pressure vessel heliumlike helium-like ion helium liquefaction helium liquefaction, hydrogen liquefaction helium liquefier helium magnetometer helium main-sequence helium maser helium mass flow helium mass spectrographic method helium mass-spectrometer helium mass-spectrometer detecting system Helium mass-spectrometer leakage detector helium mass spectrometer leak detection helium mass spectrometer leak detector helium mass spectrometer leak test helium mass spectrometric leak detector helium mass spectrum helium mass spectrum leak detecting