（一）虐待家庭成员，被虐待人或者其监护人要求处理的；
-seen_urls: set
。业内人士推荐WPS官方版本下载作为进阶阅读
The user will give a CNF in dimacs format.
Current X-ray lasers require facilities that are kilometres long. A cavity-based set-up about 66 metres in length has been developed that uses highly reflective mirrors to enable the generation of high-intensity pulses of narrow-band X-ray radiation. This promises to overcome the limitations of current X-ray lasers.