Jack hurried to the rail way station in a taxi this morning ____ ____he wouldn't miss the train to Tianjin.
Switzerland is well - known for its ____(印象深刻) mountainous scenery
为了探究硝酸钾溶液能否导电,实验步骤如下:(1)将硝酸钾晶体溶解在盛有自来水的烧杯中;(2)连接如图电路;(3)闭合开关,观察小灯泡能否发光。针对该实验目的,下列评价或改进正确的是( )
小凡同学在做“观察水的沸腾”实验中