词汇	x-ray pectrometer
释义	x-ray pectrometer X射线分光计
随便看	principal decision-making principal defecation principal defect principal deformability principal deformation principal degree principal derivative principal design section principal design sections principal desk principal determinant principal developing activity principal developing agency Principal Development Activity Principal Development Agency principal development program principal device principal diagnosis principal diagonal principal diagonal polynomial principal diagonals principal dielectric constants principal differential analysis principal dimension principal dimension of hull dimension