... lbf 0.454 kgf x 40 = 18.16 kgf 2. psi = pond per squire inch 單位是lb/in^2 1 in=2.54 cm 1 in^2=2.54 x 2.54 cm^2 65psi=65 x 0.454 / (2.54 x2 ...
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