这是因为地毯有两种基本的等级-厚型或者加厚地毯。
However carpet comes in two basic grades - heavy and extra heavy duty.
基本罪行等级：罪行等级适用于其下述罪行。
Base offense level: the offense level applicable to the underlying offense.
基本罪行等级假定武器的出现。
The presence of a weapon is assumed in the base offense level.
等级系统中的基本单位是群丛。
产品质量等级的识别。是质量检验的一项基本功。
The identifying of products' quality degree is a basic skill for quality inspection.
经国家级权威部门检测防火等级达到B1级，基本上满足工程的防火要求。
The national authorities detection fire level, basically meet the engineering B1 level of fire.
经国家级权威部门检测防火等级达到B1级，基本上满足工程的防火要求。
The national authorities detection fire level, basically meet the engineering B1 level of fire.
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