题目

实验室制取1－氯丙烷（沸点46.6 ℃）的正确操作顺序是 ①向蒸馏烧瓶中加入固体氯化钠，再加入1－丙醇及浓硫酸混合液，塞好带温度计的木塞  ②把蒸馏烧瓶固定在铁架台上，塞好带温度计的木塞  ③把酒精灯放在铁架台上，根据酒精灯的火焰确定铁圈的高度，固定铁圈，放上石棉网  ④检查装置的气密性  ⑤加热  ⑥通入冷却水A.④③②①⑤⑥                                              B.③②④①⑥⑤C.④③②①⑥⑤    �15、Working at home, which one could hardly imagine, has been made _____ with the development of computer technology. A．possible           B．it possible           C．possibly           D．to be possible