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【单选题】
9%的NaCl(摩尔质量58.5g·mol -1 )溶液产生的渗透压接近于(    )
A.
5.8%的蔗糖溶液    
B.
2.9%的蔗糖溶液
C.
0.5mol·kg -1 的蔗糖溶液    
D.
1mol·kg -1 的蔗糖溶液
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专权型领导
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A.
拥塞控制
B.
差错控制
C.
路由选择
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流量控制
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