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1
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2
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3
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1.
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姝ょ被鍙樺寲銆?/p>
鏍规嵁娆у瀹氬緥锛岀數闃?/p>
R
銆佺數鍘?/p>
U
銆佺數娴?/p>
I,
鏈夊涓嬪叧绯伙細
I
U
R
飥?/p>
锛?/p>
1
锛?/p>
鐢辩數鍘嬭〃鍜岀數娴佽〃鐨勭ず鍊?/p>
U
鍜?/p>
I
璁＄畻鍙緱鍒板緟娴嬪厓浠?/p>
Rx
鐨勯樆鍊笺�備絾闈炵嚎鎬у厓浠剁殑
R
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锛岀敤
R
D
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r
D
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鍘嬫敼鍙橀噺涓庣數娴佹敼鍙橀噺涔嬫瘮銆傚姩鎬佺數闃诲彲閫氳繃浼忓畨鏇茬嚎姹傚嚭锛屽鍥?/p>
1
鎵�绀猴紝鍥句腑
Q
鐐圭殑闈欐�佺數闃?/p>
R
D
=U
Q
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Q
,
鍔ㄦ�佺數闃?/p>
r
D
=dU
Q
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Q