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發表於 2010-12-30 09:55
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祝大家永遠快樂! ^^
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First law: Every body remains in a state of rest or uniform motion unless it is acted upon by an external unbalanced force.
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祝大家永遠快樂! ^^
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First law: Every body remains in a state of rest or uniform motion unless it is acted upon by an external unbalanced force.
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