【单选题】【消耗次数：1】
Modern machinery _______ been installed in this newly-built factory.
①
has
②
have
③
is
④
are
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随机题目
【单选题】
子宫内膜癌影像学表现以下错误的是
①
T1低信号，T2不均匀稍高信号，低于子宫内膜
②
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