{0>分级查询技术： _<}0{>Multistage Query Mechanism_<0}

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CMQM 分级查询技术与以往常规的查询技术相比，有着明显的不同。 _<}0{>CMQM is quite different from anciently routine inquiry technology. _<0}{0>后者往往需要使用者一次性将查询条件设定正确，以获得查询结果，否则必须重新设定所有查询条件，一切从头做起。 _<}0{>The latter sometimes need user to customize query criterion exactly at one shot in order to acquire inquiry result, otherwise must reset all the query criterions, and start from scratch. _<0}{0>这种方法的缺点是：要求使用者在设定条件之初必须明确查询条件及其之间的正确的逻辑关系，没有给使用者留下尝试（Retry）的余地。 _<}0{>Shortcoming of this kind of approach is that the user has to nail down the correct logical relation between query criterions in the beginning of customization, leave the user no leeway for retry. _<0}{0>而在相当多的查询情况下，这种尝试是非常重要的。 _{<}0{>Moreover} Moreover, under quite a number of query conditions, this kind of attempt is very important. _<0}{0>CMQM则可以让使用者不断地根据当前的查询结果调整下一步的查询条件设定，必要时还可以返回到前一级的查询结果，调整查询的路线。 _<}0{>CMQM allow user continually adjust the next step query criterion according to current inquiry result, well enough to go back to the result of earlier stage and to adjust the inquiry path in case of need. This_<0}{0>使查询成为一个探索和尝试的过程，这非常符合查询行为的思维规律，尤其是对一些复杂的查询，不可能设想一次成功，探索和尝试则更显重要。 _<}0{> will turn inquiry into a probe and tentative course which is well conform with the behavioral thinking law of query, in particular toward some complicate inquiry where to imagine success in a single try is impossible, probe and attempt then still show its importance.