这个课题的教学目标是使学生认识简易装置的结构原理和使用方法与启普发生器是一样的．从教学方法上说应是启发式．在讲这个课题之前，先和学生一起回顾一下启普发生器构造．它是由三部分构成：（1）球形漏斗，（2）容器（上部为球形，下部为较大半球形）；（3）带活栓的导气管 The teaching goal of this topic is to make students understand that the structure and principle of the simple device are the same as those of the Kaipu generator. From the teaching method, it should be a heuristic. Before speaking about this subject, first review with students the Kip generator structure. It consists of three parts: (1) spherical funnel, (2) container (the upper part is spherical, the lower part is larger hemisphere); (3) the air tube with a live plug