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【单选题】
发现包含语种聚类在内一共有（）类A.
10
B.
11
C.
12
D.
13
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
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A.
15~30分钟内滴完
B.
30~60分钟内滴完
C.
60~90分钟内滴完
D.
每分钟不超过60滴
E.
速度快慢不影响疗效
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