根据《房屋建筑工程施工旁站监理管理办法(试行)》的规定，要求旁站监理人员实施全过程现场跟班监督的是( )的施工质量。

A．关键工种

B．关键岗位

C．关键部位

D．关键工序

E．关键线路

The notion of NP-completeness has provided a (66) mathematical definition for (67) intractability of NP problems. But this measure applies only to worst-case complexity. Being NP-complete does not (68) that a problem is intractable on the average case. Indeed, some NP-complete problems are " (69) on average", though some may not be. Levin initiated the study of average-case intractability, He showed that a bounded tiling problem under a simple distribution is average-case NP-complete. Since then, several additional average-case NP-complete problems have been shown within Levin’s (70) . This paper is intended to provide a comprehensive survey of average-case NP-complete problems that have been published so far, and the techniques of obtaining these results.

（67）处填（）。

A．accessing

B．calculating

C．counting

D．measuring