But enough evidence has accumulated to prove that some proteins can in fact copy themselves and that variants of prp are essential players in spongiform encephalopathies 但是充足的证据证明，某些蛋白质的确可以自我复制，且普恩蛋白变体在海绵状脑病上扮演了重要角色。
D : many firms in the metalworking industry have moderized production equipment in the last five years , and most of these introduced prp contracts the same time 问题：这个选项并没有讲现化化使生产率提高，如果有讲，那当然是他因，但d根本没讲，只是讲现代化和prp的引进时间相同。
Hcbc is proven secure against chosen - plaintext attacks assuming that e is a prp secure against chosen - plaintext attacks , while hpcbc is proven secure against choen - ciphertext attacks assuming that e is a prp secure against chosen _ ciphertext attacks 但是如果假设是一个抗选择密文攻击的安全伪随机置换，则可以证明hpcbc对选择密文攻击是安全的。
Although hippocampal neurons and astrocytes also showed positive binding , cerebellar granule neurons are the more promising binding source because of their high yield , good binding and biological relevance . in the second part , prp was constructed into a recombinant protein with human igg fc fragment ( prpfc ) and used directly to interact with its bindin 再次，在受体的鉴别和分离中，改进传统的亲和层析方法，以多功能交联剂连接配体和受体，并分别以streptavidin及proteina偶联的磁珠为结合反应载体，省lo以酉i
The paper put forward a new method of machining different top and bottom shaped workpieces based on difference interpolation theory , the method calculated the displacement of prp and psp plane to equivalent accumulated displacements of uv and xy plane , which was of advantages for simplifying programming , reducing accumulative errors caused by traditional calculation method and increasing machining precision 摘要提出了基于差分插补理论的加工上下异型面工件的新方法，把工件的下表面（参考平面， prp ）和工件的上表面（第二平面， psp ）上的插补运动位移换算为uv及xy两平面上的位移叠加，具有简化编程、减小传统计算方法产生的累积误差、提高加工精度的明显优点。
In this thesis , we mainly discuss the algorithm and the theory of conjugate gradient method . the structure of this paper is organized as follows : in the first chapter we survey the history of conjugate gradient method , and discuss five conjugate gradient methods respectively which are fr method , prp method , hs method , cd method , dy method . they are currently considered to be well - known methods for large scale unconstrained optimization problems 本文主要研究了共轭梯度法的算法和理论，得到了一些理论和数值结果。文中首先介绍共轭梯度法的发展概况，对几种著名的共轭梯度法fr方法， prp方法， hs方法， cd方法和dy方法的全局收敛性，全局有效性及数值计算作了综述。
