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Pï¼pgh hï¼8cmï¼0.08m
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Pï¼F/Sï¼ Sï¼50cm2ï¼0.005m2
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3ã
Fï¼Gæ» mï¼500gï¼0.5kg
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Pï¼F/Sï¼Gæ»/Sï¼5/0.005ï¼1000Pa
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