上述特征反映了狼山花岗岩是未经熔融岩浆阶段改造的原地交代成因花岗岩。
From the above, it is evident that the Langshan granite is an in-situ metasomatic granite, which has not undergone the phase of melting magma.
并以吉林省西部平原地区地下水水质为例，研究了该区地下水水质恶化地区的分布、趋势、恶化预警等级及其成因。
The system is used to research the groundwater quality in the west plain of Jilin province, the distribution, trend, level and orig…
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