当进行每一步的活门测试时，确保没有泄漏，没有腐蚀，没有生锈并且在整个程序结束后再次确认。

AA. While you do each step of the valve test, make sure that there is no leakage, no corrosion, no rust and do the double check AFT the whole procedure again.

BB. While you do one step of the piston test, make sure that there is no leak, no corruption, no rus and do the double check thru the whole procedure again.

CC. While you do each step of the valve test, ensure that there is no leakage, no corruption, no rust and do the double check AFT the whole procedure again.