Cann't the shell have two intermediaries

There is only one summary in the end. If an intermediary is involved, his authority and responsibility are relatively clear. If you work on two or three cases, it's easy for him to argue with each other. Finally, I don't know who should be responsible for the accident.

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In order to help physics and chemistry teachers solve the above problems and improve the teaching quality of physics and chemistry, Shell Network has launched a new online virtual laboratory for physics and chemistry students to meet the requirements of educational informationization.