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3
鍒?/p>
闅惧害绯绘暟绛夌骇锛?/p>
1
3
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x
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t
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5 m.
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2 m
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B
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娴欐睙娴锋磱瀛﹂櫌
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闅惧害绯绘暟绛夌骇锛?/p>
1
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dr
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|
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1
1
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(A)
鍒囧悜鍔犻�熷害鏀瑰彉锛屾硶鍚戝姞閫熷害涔熸敼鍙橈紟
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B
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棰樺彿锛?/p>
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鍒嗘暟锛?/p>
3
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闅惧害绯绘暟绛夌骇锛?/p>
1
2
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r
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2
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a
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b
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甯搁噺锛?/p>
,
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锛?/p>
(A)
鍖�閫熺洿绾胯繍鍔紟
(B)
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鎶涚墿绾胯繍鍔紟
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B
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