parent material

基本解释

Using J607RH welding rod made in China, the weld seam metal and the parent material are of iso-strength.
焊缝金属与母材的强度配合表现为等强匹配，国产J607RH焊条均能与之获得较好的强度匹配。
The internal relations between the development of principal soil genus and sedimentary parent material types are analysed.
滨湖相和海相五种类型，初步探讨了该平原主要土属的发育与沉积母质类型之间的内在关系。
Under the same parent material condition, urease activity was significantly correlated with forming time and maturity of soil.
在母质相同的情况下，脲酶活性高低又与成土时间的长短和土壤熟化程度呈正相关。