problem log问题日志problemn.问题；难题；习题adj.成问题的；难对付的problem of banning nuclear explosion禁止核爆炸问题Problem-Based-Learning education以问题为基础教学Problem of resources and environment资源与环境问题problem Nonuniform transmission line非均匀传输线Problem Analysis by Logical Approach逻辑方法问题分析problem- based- teaching rnethods问题教学方式problem-solving practice simulation问题求解实践模拟problem characteristics and fire type问题特征与火灾类型Problem Identification and Correction问题识别与纠正problem-solving telephone hot-line问题求解电话热线