M

main 总管、干管

main duct通风〕总管、〔通风〕干管

main pipe总管、干管

make-up water pump补给水泵

manual control手动控制

mass concentration质量浓度

maximum allowable concentration (MAC)最高容许浓度

maximum coefficient of heat transfer最大传热系数

maximum depth of frozen ground最大冻土深度

maximum sum of hourly colling load逐时冷负荷综合最大值

mean annual temperature (humidity)年平均温（湿）度

mean annual temperature (humidity)日平均温（湿）度

mean daily temperature (humidity)旬平均温（湿）度

mean dekad temperature (humidity)月平均最高温度

mean monthly maximum temperature月平均最低温度

mean monthly minimum temperature月平均湿（湿）度

mean monthly temperature (humidity)平均相对湿度

mean relative humidity平均风速

emchanical air supply system机械送风系统

mechanical and hydraulic联合除尘

combined dust removal机械式风速仪