欠平衡钻井井控与常规钻井井控差异及施工原则；
The difference of well control between UBD and conventional drilling;
掌握巷道围岩的变形规律是寻求合理的巷道施工原则和支护方案的前提条件。
That grasping the deformation laws of the tunnel surrounding rock is the precondition for searching reasonable constructing principle and supporting scheme.
介绍了采用HDPE膜做污水池浮动盖的设计和施工原则，浮动盖的构成、材料选用和施工安装要点等。
The article introduces principle of design and construction of HDPE film floating cover for sewage sink, construction of the cover, material selection as well as key points of its installation.
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