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【单选题】
商品的( )是指同一类商品中,不同的质量、不同尺寸、不同花色品种的数量。
A.
广度
B.
宽度
C.
深度
D.
长度
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B.
血液粘稠度增加
C.
血容量增多
D.
肺部毛细血管栓子形成
E.
缺氧及二氧化碳储留引起的肺小动脉痉挛
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【单选题】肺源性心脏病肺动脉高压形成最主要的因素为
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肺部毛细血管床减少
B.
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