At layer boundaries, that is, a place where different materials with different elastic parameters come into contact with one another, components of the waves are reflected and return to the surface.
在地层的交界处(指具有不同弹性参数的物质相交地带)，部分震波会反射到地表。
The patching coat consists of the primary layer made of polyether polyurethane and the surface layer made of elastic polyurethane.
修补的涂层由聚醚聚氨酯底层和弹性聚氨酯面层组合而成。
A charging member is provided having a support, a conductive elastic layer formed on the support and a surface layer formed on the conductive elastic layer.
提供一种充电构件，其具有支承体、形成于该支承体上的导电性弹性层和形成于该导电性弹性层上的表面层。
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