2007年9月20日，全国政协常委何鸿燊以6 910万港元，成功购入圆明园十二生肖“水力钟喷泉之马首铜像”，并将其捐给国家。马首铜像在海外漂泊一百四十多年后又回到祖国，导致它流失海外的罪魁祸首是(　　)

已知$△ABC$中，$AB=1.5,AC=2,\sin B=\frac{2}{3}$.则C=（  ）。

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