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简述苦寒败胃的含义。

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肺肿瘤不是肺灌注显像的适应证。()

A. 正确
B. 错误

简述精液槽(φ12*10):焊接标准及验收标准。

If you are forced to abandon ship in a lifeboat,you should().

A. remain in the immediate vicinity
B. head for the nearest land
C. head for the closest sea-lanes
D. vote on what to do,so all hands will have a part in the decisio

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