We have a total of 4 team members, and everyone actively participated and finally completed the low-cost hand pump. The test result is very satisfactory and meets the test requirements.

Team member D (john), due to COVID-19, I was unable to help other team members make a hand pump in the laboratory. Share the workload of other team members as much as possible in the hand pump report, and actively cooperate with other team members to complete the report.

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⢀⣀⣀⠀⠀⠀⠀⠀⠀⣿⢷⡄⠀⠀⠀⠀⠀⣀⣠⣤⣤⡤⠆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⣌⠉⠉⣛⣷⡴⠶⠶⠶⣟⡆⠙⣧⣤⡴⠞⠛⠉⠉⠀⠀⢀⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⢻⡄⠻⣯⡀⠀⠀⠀⠀⠀⠀⠀⠈⠛⠆⠀⠀⠀⠀⠀⠀⢼⠇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠸⣇⠀⠈⠙⠷⠆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⡿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⢻⡆⠀⠀⢀⣤⣤⣀⠀⠀⠀⣴⡞⠾⣦⡀⠀⠀⣠⡾⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠈⢻⣆⠀⣾⠁⡏⢹⠀⠀⢐⡇⠸⠀⠸⠇⠀⠶⣾⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⢈⡽⣂⢃⠀⣇⢸⠀⡀⢀⡧⠼⠀⣰⣶⠆⢰⡟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠈⢻⡿⣟⡃⠈⠘⠻⣯⡉⣿⠀⠀⠀⣠⡟⣘⣷⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⢸⣇⣨⣛⣶⠶⠲⠈⠛⠋⠀⠀⠚⣿⣀⣉⣡⣤⣤⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⢀⣴⡾⡛⠫⣿⠳⣥⡀⠀⠀⠀⠀⠀⠀⠀⠀⢹⡟⢭⢈⠈⠙⢷⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⢀⣾⠡⢕⠈⠈⡼⣟⣿⠀⠀⠀⠀⠀⠀⠀⢠⡀⢹⡡⡁⣀⢣⠁⢸⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⣯⠀⠘⠢⠂⠀⣿⠻⢾⠀⠀⠀⠀⠀⠀⠈⢻⣌⠗⠈⠈⠀⠀⢸⡇⠀⠀⠀⠀⠀⠀⠀⣠⣿⠀⠀
⠀⠀⠀⠀⢹⣇⠀⠀⠀⠀⠀⠀⢹⡇⠀⠀⠀⠀⠀⠀⢸⡻⣦⡀⠀⠀⠀⣸⠇⠀⠀⠀⠀⠀⣠⡾⠋⣿⠀⠀
⠀⠀⠀⠀⠀⢻⣆⠀⠀⠀⠀⣰⣿⠃⠀⠀⠀⠀⠀⠀⠈⣦⣈⠻⠶⠆⣠⣿⣆⣤⢾⡄⣠⡾⠋⠀⠀⢸⡆⠀
⠀⠀⠀⠀⠀⠀⠙⢷⣀⣀⡾⣻⠇⠀⠀⠀⠀⠀⠀⠀⠀⠈⠙⢿⡟⠛⠛⠓⠉⠀⠸⠟⠁⠀⠀⠀⠀⠈⣇⠀
⠀⠀⠀⠀⠀⠀⠀⠘⠋⠉⢱⡏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢿⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡟⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠰⢶⣿⡁⠀⠀⠘⢳⡖⠀⠀⠀⠀⠀⠀⣼⠇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢰⡇⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠰⣿⡄⠀⠀⠀⠨⣏⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⣧⠀⠀⠀⠀⣭⠀⠀⠀⠀⢀⣀⣿⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⣤⠟⠁⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢹⡶⠶⢦⠌⣿⠛⠛⠛⠛⠋⡉⣿⠀⠀⢀⠀⠀⢠⡴⠶⠶⠛⠉⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣷⣀⢀⡀⣽⡇⠤⠤⠒⠊⠀⣻⠄⠀⠘⠻⠶⠾⠛⠂⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢹⡆⠀⠀⢐⡧⠀⠀⠀⠀⡠⣾⠂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⣷⠒⠒⠁⣿⠂⠒⠈⠉⠀⣾⠂⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢹⡆⠄⠒⠹⡗⠂⠒⠒⠉⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀