题目内容
地下水上覆地层有一定的截留、自净能力，当污染组分的量超过其容量时，才会发生污染
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[音频]China aims to build more than 600,000 5G base stations in 2021. The ministry will ___1__its focus from network "___2__ and popularization" to "___3___ of speed and quality". It also plans to build a "double gigabit" network____4__ covering urban areas and towns where conditions are ____5__ in three years, and promote the ____6___construction and deep coverage of 5G networks in an____7___manner, according to the Ministry.
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