theoretical law理论法学theoreticaladj.理论上的theoretical cutoff frequency理论截止频率theoretical nose of crossing辙叉理论尖端theoretical cutoff frequence［电工］理论截止频率theoretical specific impulse理论比推力theoretical research methods理论研究方法theoretical shape prediction理论形态预测theoretical length of points道岔理论长度theoretical lowest low water理论最低潮面Theoretical Research Reactor理论研究报告theoretical retention volume理论保留体积