According to the damage reason of the chemical reaction tower and the elementary test, this paper thinks the main factor to affect the safety of the tower is the stress in the work.

根据化工反应塔的损伤原因和对塔体进行的初步安全检测，提出影响该受损塔体安全的主要因素是其工作过程中所受到的应力。

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In this paper we get a seeking unified method of the least common multiple the greatest common factor and coefficients polynomial by implementing elementary row transformation in a polynomial matrix.

利用矩阵的初等变换，给出了两个多项式的最小公倍式、最大公因式及其系数多项式的统一求法。

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Method: Using stratified cluster sampling, sampling an elementary school respectively in the city and countryside, carries on the check by sight and the correlation factor investigation.

方法：应用分层整群抽样方法，在城市、农村小学中各抽取一所小学，进行视力检查及相关因素调查。

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