摘要：模型假设 1． 假设 ⑴．各井巷的空气阻力忽略不计； ⑵．监测数据无任何误差； ⑶．进风口不受粉尘、煤尘、灰尘、有害气体以及高温气体的影响； 2． 符号说明 Q矿——煤矿实际通风量； ∑Q采——采煤工作面实际通风量的总和，m3/min； ∑Q掘——掘进工作面实际通风量的总和，m3/min； ∑Q其——矿井除了采、掘地点以外的其它巷道需风量的总和，... 阅读全文

摘要：I should think about content,ask questions,anticipate practical uses,solve potential problems,and draw connections between ideas.The following figure lists is acive learners' figure.*Class lectures* ... 阅读全文

摘要：About class time College class time is used primarily to introduce content that is to be learned and to discuss ideas. Instractors expect I to learn the material and to be prepared to discuss it in cl... 阅读全文