单项选择题

下列哪项征象可提示为恶性溃疡()

A. 龛影位于腔外
B. 狭颈征
C. 项圈征
D. 黏膜放射状纠集
E. 环堤征
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单项选择题
Father will not ____ us to touch anything in his room when he is away.
A、have
B、let
C、agree
D、allow
单项选择题
肺脓肿常见临床症状为()
A. 咳嗽、咳痰、咯血
B. 咳嗽、咳脓臭痰、发热
C. 咳嗽、咳铁锈色痰、发热
D. 咳嗽、咳白色泡沫样粘痰、发热
E. 咳嗽、咳粉红色泡沫样痰
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