It's disbennifit to become protected film if change the velocity of flow frequently.
频繁改变的流速不利于在冷却器材料表面形成保护膜,而保护膜对于防腐蚀是至的。
Filter bed should be exposurd as less as possible because alternation of exposure and immersion is disbennifit to the penetrability of filter bed.
据料分析了源安全保障。
Our country practices tail system,and takes direct mode of inherit.It is very disbennifit to protect debtee because there is not efficiency supervision to haeres.So it is necessary to restrict haeres.
我国实行限定继承的继承制度,又采取的是直接继承的方式,在缺乏对继承人有效监督的情况下,对债权人的保护极为不利,有必对继承人予以限制。
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