置换

In order to solve the technical problems of mining strip extraction coal-pillar and waste disposal, the waste substitution extraction is proposed.

针对建下条采煤柱回收和井下矸石处理的重大技术难题，提出矸石置换开采。

Poly (N-isopropylacrylamide) macromonomer with a styrol end group was prepared by free radical polymerization of NIPAAm.

用链转移自由基聚合和端基置换反应，合成了聚N-异丙基丙烯酰胺热敏性大分子单体。

In this note the author showed that if s is nonnegative integer and A∈B n,n+s, then |R|=2 n if and only if A contains a submatrix which is permutation equivalent to the unit matrix of order n.

作者证明：如果s是一个非负整数且A ∈Bn ，n+s，那么｜R ｜=2 n 当且仅当A含有置换等价于n阶单位矩阵的一个子阵

Results 6 cases giant substernal goiter were treated by collar-thyroid-incision and partial upper median sternotomy.3 cases with superior vena cava syndrom were treated with tumor resection and artificial vessel replacement or auto pericardium suture.2 cases were second time surgery for entire resection of the...

结果取颈部低位领状切口切除巨大胸骨后甲状腺肿6例；3例合并上腔静脉综合征患者分别行纵隔肿瘤切除、人工血管置换或自体心包修补术；再次手术完整切除纵隔肿瘤2例；手术治疗因肿瘤反复破溃引起纵隔感染、冻结2例。

In cryptography,a cipher produced by a composition of a number of substitution and transposition cipher s.

密码学中，由替代密码和置换密码结合使用而构成的一种密码。

The block cipher with a substitution permutation network is the best known and widely used block cipher system.

包含代替置换网络的分组密码是一种广泛使用的分组密码系统。

The other method is substitution.

另一个方法是置换。

An engineering case study is presented for application of vibration and substitution method in reinforce- ment of cohesive soil foundation.

以振冲置换法在粘性土地基加固工程中的一个实例，证明复合地基承载力能满足设计要求，对几个与质量有关的问题进行了探讨。

The substitution of one kind of payment for another.

置换为另一种支付方式的行为。

A homogeneous crystalline phase that contains two or more chemical species.Both substitutional and interstitial solid solutions are possible.

包含两种或两种以上元素的均匀单相，固溶体可以以置换固溶体或间隙固溶体的形式存在。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。