本文逐项分析，提出思考问题，供高校甄别。
This paper raises various questions for universities to refer to.
采用化学成分分析、电镜扫描等方法，对出现裂纹的换热器板片样品进行了逐项分析。
By chemical composition analysis, SEM and other analytical methods, the cause of cracking of plate heat exchanger was investigated.
并结合此工程洽商变更单的内容，逐项分析，解决第二章归纳出来的问题。(4)建筑工程洽商变更计价分析。
And combined with the content of this change order, analysis item by item, to solve the problems summarized of second part. (4) the analysis of cost of construction project change.
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