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男，72岁，10年前因心肌梗死住院。5年前出现活动后气短，夜间.....
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The author may regard risks as something______.A．t.....
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长期成本函数与短期成本函数的区别在于（)。A.时间长短不同B......
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According to the interview, what happened since Ma.....
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患者男，23岁。腹痛、腹泻、间断脓血便2年，大便成形或糊状，.....
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Language performance and language acquisition are the two principle concerns of the psych..
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