【简答题】热线式 空气流量计 和热膜式 空气流量计 两种均属于
【判断题】热膜式空气流量计与热线式空气流量计的结构和工作原理不相同
【单选题】维生素A醋酸酯胶丸测定含量时,取内容物m,加环己烷溶解并稀释至10ml,摇匀,精密量取0.1ml,再加己烷溶解并稀释至10ml,使其浓度为9~15IU/mol。
维生素A的鉴别试验为()
【单选题】A less immediate but still serious concern was that most cities were ______________ ugly that they seemed to produce people who were ignorant of the beauty of nature and incapable of creativity.
【简答题】维生素A醋酸酯胶丸的含量测定:取内容物W,加环己烷溶解并稀释至10ml,摇匀。精密量取0.1ml,再加环己烷稀释至10ml,使其浓度为9~15IU/ml。已知内容物平均重量为80.0mg,其每丸标示量为3000IU。求取样量(W)的范围。
【判断题】热线式和热膜式空气流量计属于质量型空气流量计。
【单选题】和热线式空气流量计相比,热膜式空气流量计具有( )优势。
【简答题】热线式和热膜式空气流量计均是体积空气流量计。( )
【判断题】热线式和热膜式空气流量计属于体积流量型空气流量计。