Use your own reasoning. Don't stop even if the formula is too large just try to solve it manually.
第四十二条 从事涉及国家秘密的原子能研究、开发和利用活动的单位，应当依法建立健全保密管理制度，完善保密防护措施，开展保密宣传教育，加强保密监督检查。
。关于这个话题，爱思助手下载最新版本提供了深入分析
Our 51 judges have picked Shane Warne, Don Bradman and Ian Botham as their top three. Who gets your vote?
The tree behind the grid