第8题: [单项选择]圆形风道,直径d=0.8m,风量为36000m3/h,空气的运动黏滞系数v=15.7℃10-6m2·s,风道壁面材料的当量绝对糙度K=0.1mm,在l=12m长的管段测得沿程阻力Pf=45Pa,用莫迪公式计算风道的沿程阻力系数λ=( )。 A. 1.3 B. 0.13 C. 0.013 D. 0.0013 参考答案:C
第20题: [单项选择]If we have a quote of 1.4950/1.4960 for $/DM, _____ A. the first rate is the buying rate for the dollar B. the first rate is the buying rate for the DM C. the second rate is the buying rate for the dollar D. the second rate is the selling rate for the DM. 参考答案:A
第24题: [单项选择]男性,60岁,1个月来乏力、食欲不振,两周来气短,干咳,喜右侧卧位,既往有糖尿病史,其配偶半年前患空洞型肺结核。查体:T37.5℃,右肩胛下角线第8肋以下叩诊呈浊音,呼吸音消失,语颤减弱,肝脾肋下未及。化验:Glu8.7mmol/L,血WB(5.0×10/L,Hb130g/L。X线:右下肺野内低外高密度增高影。临床上考虑为结核性胸膜炎。此患者胸水化验结果哪项可能性最小() A. 草黄色 B. 比重>1.018 C. 黏蛋白定性试验(+) D. ADA>40U/L E. 蛋白定量<20g/L 参考答案:E
第28题: [单项选择]What is the main idea of the passage A. American people move a lot in history. B. Downtown areas are too crowded to live. C. Moving to suburbs is not the answer to an ideal environment. D. Cities are likely to be replaced by the suburbs. 参考答案:C 答案解析:[试题分析] 细节推理题。
[详细解答] 依据课文内容我们得知,在美国历史上,人们大量移入郊区,从而使得城市的建设一度破落。商业的进一步搬迁使得城市建设更加落后。但每天在城市与住所之间数个小时的往返