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言前在干燥环境下进行生物地球化学取样,首先必须解决的问题是,要选择一种均匀分布于整个测区的介质并可采集足够的待测样品;其次是可望选择一种与采样介质无关并
The first problem that must be solved before speech is carried out in a dry environment is that it is necessary to select a medium that is uniformly distributed throughout the survey area and to collect enough samples to be tested. Second, it is expected that one sample, Not related