521. 化学工程基础 Elementary Chemical Engineering
522. 化学计量学 Chemical Measurement
523. 化学文献 Chemical Literature
524. 化学文献及查阅方法 Chemical Literature & Consulting Method
525. 化学粘结剂 Chemical Felter
526. 环境保护理论基础 Basic Theory of Environmental Protection
527. 环境化学 Environomental Chemistry
528. 环境行为概论 Introduction to Environmental Behavior
529. 换热器 Thermal Transducer
530. 回旧分析与试验设计 Tempering Analysis and Experiment Design
