单词	the oxygen group elements
释义	the oxygen group elements 氧族元素
随便看	double-layer reinforcement mat double-layer reinforcing mesh double layer resist system double-layer reticulated dome double-layer reticulated spherical dome double-layer reticulated spherical shell double-layer ring-stiffened double layers double-layer satellite network double-layers BP neural network Double-layers BP Neural Network double layers chromosome double layer screen double-layer screen double-layer shaped charges double-layer shield Double-layer shielding double layer sintering double layers of castings double layers of sprinkling double-layer soil double layer soil foundation double layers orebodies double-layer space grids double layer sphere