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【单选题】
主养鳙亲鱼池的鳙亲鱼放养密度一般为每亩( )。A.
30-50kg
B.
50-80kg
C.
80-100kg
D.
100-150kg
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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A.
1
B.
2
C.
3
D.
4
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A.
feast
B.
congratulations
C.
festival
D.
recreation
【简答题】阅读下文，寻找规律 （1） （2）观察上式：猜想： （3）根据你的猜想，计算：
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