Nearly all traces of the asteroids and comets that struck Earth billions of years ago have been erased from our planet's geologically active surface.
在地球上，所有数十亿年前被小行星和彗星撞击的痕迹，几乎都已经被地球表面的地质活动所抹去。
The south of Junggar basin has complicated structure, many entrapments and active surface, all this indicates a large resource quantity.
准噶尔盆地南缘构造复杂，圈闭众多，油气苗显示活跃，资源量大。
The south of Zhungeer basin has complicated structure, many entrapmentsand active surface indication, all this indicates a large resource quantity.
准噶尔盆地南缘构造复杂，圈闭众多，油气苗显示活跃，资源量大。
A determination method of active surface areas of copper-containing catalysts by pulse adsorption at an ambient temperature with co as adsorbate is described in the present paper.
介绍了用CO作吸附质，在室温下脉冲吸附测定铜催化剂中活性铜表面积的方法。
The homogeneous dispersion of nano-particles and processing of high-performance polymer nanocomposites still is a technical challenge due to the high active surface of nanoparticles.
纳米材料的高表面活性使其易于团聚，这为其分散和高性能纳米复合材料的制备工艺带来挑战。
In addition, the solder mask coating on printed circuit board, with the plasma treatment, can also obtain certain roughness and high active surface, thus improving the solder coating adhesion.
另外，在阻焊膜涂覆前，用等离子体对印制电路板面处理一下，还可获得一定的粗糙度和高活性的表面，从而提高阻焊膜层的附着力。
The decrease of active surface area in the anode caused by CO2 accumulation is reduced through treating the diffusion layer and catalyst layer with PTFE, resulting in increased DMFC performance.
通过对阳极扩散层和催化剂层的疏水处理，降低了阳极产生的CO2导致的催化活性比表面积损失，有效地提高了电池性能。
This indicates that, besides solar angle, time and intensity of radiation, the height of trees is also an important factor that influences thermal effects of vertical thermal active surface of edges.
显示了林窗边缘壁面的热力效应除与太阳高度角、太阳辐射的时间长短和强度有关之外，林窗边缘树木高度也是不可忽视的因子。
This indicates that, besides solar angle, time and intensity of radiation, the height of trees is also an important factor that influences thermal effects of vertical thermal active surface of edges.
显示了林窗边缘壁面的热力效应除与太阳高度角、太阳辐射的时间长短和强度有关之外，林窗边缘树木高度也是不可忽视的因子。
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