烧变岩是活鸡兔矿井的顶板充水含水层，直接威胁着矿井的生产安全。
The coal seam roof of Huojitu mine is the burnt rock, which is the water impregnated aquifer, is dangerous to mine safety.
本文介绍利用中子仪测定水文地质参数包气带田间持水量和含水层变幅带给水度的原理与方法。
This article introduces a method for determining hydrogeological parameters such as the field capacity in zone of aeration and the specific yield in aquifer where water content is varied.
而 且，能观察到加热时感热墨水层（102）变透明，基材（101）上的图 案（104）进一步重叠。
The thermosensitive ink layer 102 becomes transparent by heating and the figure 104 on the substrate 101 is also visible.
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