Objective: into the practic value of frequency field of admittance differential cephalogran.

目的: 探讨频域脑导纳图的实用价值.

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Do not askto speak French! I am out of practic.

千万别讲法语, 我已经生疏了.

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This paper presents the washing water close - cycling practic, experience and good result.

简要介绍该厂在洗水 闭路 循环实践中的做法 、 经验及取得的效果.

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Briefly are outlined their general formulae , preparation examples, usage methods and practic al results.

文章重点阐述了这两类调色剂的结构通式, 制备范例, 使用方法和应用效果.

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