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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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發表於 2010-5-13 17:05
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人生有個真正朋友的確好極
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人生有個真正朋友的確好極
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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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|
|
| |
|
|
| |
|
人生有個真正朋友的確好極
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人生有個真正朋友的確好極
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