The physics teacher looked at it for a long time and needed help understanding the answers written on this paper.

With no choice but to call the director of instruction for help, "I have a problem here ......"

Then the director of instruction sent a contact information: "This is the phone number of the teacher who wrote the questions. You can ask him if you have any questions."

The physics teacher called the number, and after the two of them exchanged WeChat, he took a picture of the problem-solving steps on the test paper and sent the photo over.

[May I ask the teacher how I should grade this question?]...