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【单选题】
下列变形中,正确的是(  )
A.
-a+b -x-y = a+b x-y
B.
a+b -x+y =- a+b x+y
C.
a+b -x+y =- a+b x-y
D.
-a+b x-y =- a+b x-y
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A.
者可能发生了
B.
栓塞
C.
吸衰竭
D.
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E.
F.
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A.
正确
B.
错误
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A.
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B.
胸腔穿刺抽气
C.
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D.
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E.
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B.
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A.
酥脆
B.
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C.
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D.
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A.
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B.
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A.
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B.
Lowering blood pressure
C.
Drinking lightly and occasionally
D.
Taking medicine on time
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