The authors characterize the forms of additive invertable operators preserving inverse matrix of the upper triangular matrix space over a field which characteristic is not 2 or 3 .

刻划了特征不为2及3的域上的上三角矩阵空间保逆矩阵的可逆加法算子的形式。

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X-type molecular sieves are synthesized by using polymer methylcellulose as a space-confined additive.

以聚合物甲基纤维素作空间位阻剂合成了X型分子筛。

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To meet the requirements of well cementing fors mall borehole and small annular space, the composite plastic fluid loss additive PT-2 was studied.

为适合小井眼、小间隙井的固井要求，研究了复合塑性降滤失剂PT—2体系。

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