Students entering the laboratory must keep quiet and be in place as arranged by the instructor. They are not allowed to walk around or change their positions at willSet.2、 Before the experiment, check whether the instruments and equipment are complete and intact according to the requirements of the experimental teaching materials, and report any problems immediatelyKnow the teacher and ensure the smooth progress of the experiment3、 During the experiment, the operation must be carried out in strict accordance with the instructor's requirements and experimental steps, and pay attention to the safety of electricity at all times,Turn on and off the power switch as required, raise your hand in case of problems, and do not walk around at will. Self designed experiments must be guidedThe operation can only be carried out with the consent of the teacher.