Methods: Adopt analytic approach of reviewing method, statistic the producing rate lung cancer by four different ways to draw materials including clamp check, brush check, rinse and needle aspiration.
方法：采用回顾性分析法，分别统计钳检、刷检、冲洗及针吸活检4种不同取材方法对肺癌的检出率。
Aimed at the feature that the locality of axis of the armature MMF is determined by the brush in dc motor, a new concept on clamp is proposed.
针对直流电动机中电枢磁动势的轴线位置由电刷决定的特征，提出了箝位概念，指出自控变频乃是箝位效应的直接后果。
Aimed at the feature that the locality of axis of the armature MMF is determined by the brush in dc motor, a new concept on clamp is proposed.
直流电动机中电枢磁动势的轴线位置是由电刷位置决定的，电刷具有箝位的功能。
Aimed at the feature that the locality of axis of the armature MMF is determined by the brush in dc motor, a new concept on clamp is proposed.
直流电动机中电枢磁动势的轴线位置是由电刷位置决定的，电刷具有箝位的功能。
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