※ 引述《s75287 (彈珠汽水)》之銘言：
: we can analysis the spring force on the load plane by control volume.
analyze
: the spring force F:
: we can know that the spring force and the distence between nozzle and load
: plane are independent
: (3) the control volume ABCD in the pressure chamber, assuming the velocity
: can be ignore.
ignored
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