In deep drift sand strata, Has adopted the freeze method to dig a pit, Has produced the freeze and thaw soil.

深厚流砂层下采用冻结法凿井，产生了冻融土。

youdao

In deep drift sand strata, Has adopted the freeze method to dig a pit, Has produced the freeze and thaw soil.

深厚流砂层下采用冻结法凿井，产生了冻融土。

youdao