松散层为第四系与新近系地层，由土质、砂、砾石、卵石层等组成。
管井出水量减少是常见的问题，特别是第四系松散层中的管井更为普遍。
The reducing in water production of tube well is a familiar problem, especially in the loose bed of the quaternary system.
它不但指母公司与其下属子公司，还包括处于战略同盟松散层的协作企业。
Not only means parent corporation with its subsidiary, but also the cooperation enterprises of the loose level of strategic alliance.
如何解决煤矿建井中的松散层、流沙和地下渗(涌)水是目前建井工程中的棘手问题。
To settle loose bed, quick sand and ingress of groundwater are trouble some problems during coalmine construction.
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