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無希望無失望
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發表於 2011-6-18 15:50
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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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無希望無失望
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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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