轻组腐殖物质 humic substance in light fraction
轻组腐殖物质 humic substance in light fraction
相关考题:
The atoms of a certain substance are () in such a way that they produce coherent light. A.excitedB.producedC.createdD.chosen
The atoms of certain substance are excited in such a way () they produce coherent light. A.whichB.whoC.thatD.what
要在SCI中查找重庆大学关于轻合金研究的文献,请问以下检索式正确的是() A、AD=Chongqing Univ* and TI=light alloyB、AD=Chongqing Univ and TI=light alloyC、AD=Chongqing Univ* and AU=light alloyD、AD=Chongqing Univ or TI=light alloy
名词解释题腐殖物质 humic substances