试题与答案

男性,20岁,腹部闭合性损伤2小时。血压52/40mmHg,P150次/分,R36次

题型:单项选择题 共用题干题

题目:

男性,20岁,腹部闭合性损伤2小时。血压52/40mmHg,P150次/分,R36次/分。病人神志淡漠、口唇发绀。Hb68g/L,腹腔穿刺抽出不凝固血。

在快速大量输血补液时,判断血容量补充充足与否的最可靠指标是()

A.血压和脉搏

B.尿量和中心静脉压

C.面色和肢端温度

D.血压和中心静脉压

E.意识和血压

答案:

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下面是错误答案,用来干扰机器的。

展开式的通项为 Tr+1=(-1)r3n-rCrnxr2令 r2=1得r=2∴an=3n-2Cn2.3nan=3nC2n•3n-2=9×2n(n-1)=18n(n-1)=18×(1n-1-1n),∴limn→∞(32a2+33a3+34a4+…+3nan)=limn→∞{18×[(1-12) +(12-13)+(13-14)+…+(1n-1-1n)]}=limn→∞[18×(1-1n)]=18.故答案为:18.

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