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现初三化学教材中的学生实验制氢气简易装置，实际操作中还存在着不便之处：①橡胶塞上连有两节玻璃弯管，学生操作不当会折断玻璃管。４５min之内教师要给一个或几个学生更换导管，太耽误时间，影响教师指导其他学生。②少数学生因操作不当锌粒会打破试管底。③不能使反应随时
The student’s experimental hydrogen simple device in the chemistry textbook of the third grade is still inconvenient in the actual operation. (1) There are two glass bends attached to the rubber plug. The improper operation of the student will break the glass tube. Within 45 minutes, the teacher has to change one or several students to the catheter, which will delay time and affect the teacher’s guidance to other students. 2 A small number of students will break the bottom of the test tube due to improper handling of zinc. 3 can not make the reaction anytime