Vsp is a typical strong np - hard problem , high effective exact algorithm is immposible to it . heuristic algorithm can resolve large - scale problem , but cannot ensure the quality of the resolution Vsp是一个典型的np -难题，高效的精确算法存在的可能性不大，启发式算法虽能快速求解大型问题，但对解的质量没有保证。
A major concern investors have about unsecured corporate bonds , no matter how highly rated , is that the rating agencies will downgrade them because of some disruptive event affecting the issuer 投资者对于没有保证的公司债券的主要担心在于，不论现在的评级有多高，一旦发生对发行人产生严重影响的事件，评级机构将调低其评级。
They find it " alarming " that transport canada , which administers the passenger protect program , could be sharing names on the list with other countries and has not provided assurances that that ' s not happening 他们认为：负责监管乘客保护计划的加拿大交通部可能将这份名单提供给其它国家，然而交通部并没有保证这种事情不会发生。
Even then , there is no guarantee it will work well ? as three large clinical trials unveiled at this week ' s meeting of the american society of clinical oncology , in chicago , sadly demonstrate 但甚至在那时，也没有保证这个药物会有很好的疗效?正如三个在美国临床肿瘤协会会议上揭露的大型临床试验所显示的那样，该会议于本周在芝加哥举行。
Although messages posted are not the responsibility of this forum and we are not responsible for the content or accuracy of any of these messages , we reserve the right to delete any message for any or no reason whatsoever 虽然已发布的信息责任不在于此论坛，我们也没有保证信息真实性的责任，但我们仍然保留因某些原因删除信息的权利。
Obviously , these results underline the experience of numerous upland farmers : cultivation without safeguarding a fast and stable vegetative cover of crops inevitably leads to soil loss which means loss of productivity 显然，这些结果与无数旱地农民的经验相符合：没有保证作物快速稳定的植被覆盖层的耕作无疑会造成土壤损失，进而引起生产力损失。
Finally , two new security applications are developed based on tpm . tpm provides services by its apis ( application programming interface ) , but the security of these apis is not mentioned in tcg ’ s specification and not guaranteed by tcg 可信平台模块的各种能力是以api ( applicationprogramminginterface )方式提供的,但这些可信平台模块api是否安全,在可信平台模块规范中没有涉及,也没有保证。
" extension mechanism for value object inheritance is outside of the ws - i basic profile , although not specifically excluded by it . " therefore , although that article demonstrates interoperability , there is no guarantee of interoperability with other web services environments until the web services interoperability organization ws - i , see 因此，虽然那篇文章演示了互操作性，但没有保证与其他web服务环境的互操作性，直到web服务互操作性组织（ ws - i ，参阅
As bank notes are only one element of the monetary base , and as the convertibility of large amounts of bank notes into other forms of money is not guaranteed , this arrangement was actually rather ineffective in the achievement of the monetary policy objective of a stable exchange rate 7 . 80港元的固定汇率发行及赎回。由于银行纸币只是货币基础其中一个组成项目，而且能否把大量银行纸币兑换成其他形式的货币是没有保证的，因此这项安排对达致稳定汇率的货币政策目标其实是没有多少作用。
