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问题
单项选择题
腹部实质性脏器手术的切口属于（）。
A.清创伤口
B.可能污染伤口
C.污染伤口
D.感染伤口
E.轻度污染伤口
答案
参考答案：
A
选择题
That piece of music sounds quite familiar. Who _____ the piano upstairs?
A. has played
B. played
C. plays
D. is playing
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名词解释
磁极
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