effective lap有效搭接effectiveadj.有效的；生效的；实际的effective reaction energy反应有效能effectiveness of practice实践有效质effective access sequence有效访问序列effective reflection area有效反射面积effective Reynolds number有效雷诺数effective earth rs radius地球有效半径effective flow resistance有效流阻effective reflective area有效反射面积effective value measuring有效值测量effective heating surface有效受热面