使用J0203型电磁打点计时器做高一物理学生实验时，在调整到电磁打点计时器正常工作的情况下，往往还会出现打点不清晰或漏点现象。找其原因发现，由于复写纸片有一定粘度容易与打点针粘连在一起，复写纸片不随纸带的移动而转动，致使打点针在复写纸片同一位置上连续打点，因此 When using the J0203 electromagnetic point timer to do a physics student experiment, in the case of adjustment to the normal work of the electromagnetic tick timer, there is often an unclear or missing dot striking phenomenon. To find out the reason, it is found that because of the certain viscosity of the carbon paper, it is easy to stick together with the checkpoint needle, and the copy paper does not rotate with the movement of the paper tape, causing the checkpoint hand to continuously make dots at the same position of the carbon paper.