更多“下列根据商品效用命名的商品是（）”相关的问题
天然气置换过程中，当含氧量降至（）时，此时关闭放气阀，可以完成该监测点前管道的氮气置换工作。
A.2%
B.3%
C.5%
D.6.5%
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身目发黄，发热口苦，胁肋胀痛，纳呆呕恶，厌食油腻.脉滑数，证属（）
A.风热袭表证 B.风寒湿阻证 C.湿困脾胃证 D.肝胆湿热证 E.膀胱湿热证
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《南溟》这首作品，诗名典故出自（）。
A . A、《法华经》
B . B、《山海经》
C . C、《老子》
D . D、《庄子》
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自动加工过程中使用手动干预必须在执行暂停功能后才有效。
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面谈调查法具有问卷的回收率高、灵活性强和资料范围广的特点。()
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The differences in living standards around the world are vast. In 1993, the average American had an income of about $25,000. In the same year, the average Mexican earned $7,000, and the average Nigerian earned $1,500. Not surprisingly, this large variation in average income is reflected in various measures of the quality of life. Changes in living standards over time are also large. In the United States, incomes have historically grown about 2 percent per year (after adjusting for changes in the cost of living). At this rate, average income doubles every 35 years. In some countries, economic growth has been even more rapid. In Japan, for instance, average income has doubled in the past 20 years, and in South Korea it has doubled in the past 10 years. What explains these large differences in living standards among countries and over time The answer is surprisingly simple. Almost all variation in living standards is attributable to differences in countries’’ productivity—that is, the amount of goods and services produced from each hour of a worker’’s time. In nations where workers can produce a large quantity of goods and services per unit of time, most people enjoy a high standard of living; in nations where workers are less productive, most people must endure a more meager existence. Similarly, the growth rate of a nation’’s productivity determines the growth rate of its average income. The fundamental relationship between productivity and living standards is simple, but its implications are far-reaching. If productivity is the primary determinant of living standards, other explanations must be of secondary importance. For example, people might think that labor unions or minimum-wage laws contributed to the rise in living standards of American workers over the past century. Yet the real hero of American workers is their rising productivity. The relationship between productivity and living standards also has great implications for public policy. When thinking about how any policy will affect living standards, the key question is how it will affect our ability to produce goods and services. To improve living standards, policymakers need to raise productivity by ensuring that workers are well educated, have the tools needed to produce goods and services, and have access to the best available technology.
A．Labor unions.B．Minimum-wage laws.C．Rising productivity.D．Favorable public policy.
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设A为n阶矩阵，证明：r(A)=1的充分必要条件是存在n维非零列向量α，β，使得A=αβT
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2.2 已知线性规划问题
\mathrm{m}\mathrm{a}\mathrm{x}\space z=6{x}_{1}+10{x}_{2}+9{x}_{3}+20{x}_{4} 对偶变量
\mathrm{s}.\mathrm{t}.\left\{\begin{array}{l}4{x}_{1}+9{x}_{2}+7{x}_{3}+10{x}_{4}\leqslant 600\;\;\;\;\;\;\;\;\;\;\;\;\;{y}_{1}\\ {x}_{1}+{x}_{2}+3{x}_{3}+40{x}_{4}\leqslant 400\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;{y}_{2}\\ 3{x}_{1}+4{x}_{2}+2{x}_{3}+{x}_{4}\leqslant 500\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;{y}_{3}\\ {x}_{j}\geqslant 0(j=1,\cdots ,4)\end{array}\right.其最优解为
{x}_{1}=400/3,{x}_{2}={x}_{3}=0,{x}_{4}=20/3,z^{*}=2800/3要求：（a）写出其对偶问题；（b）根据互补松弛性质找出对偶问题最优解。
A．变应原引起的IgE介导的变态反应B．IgM、IgM与细胞或组织的抗原结合，补体介导的细胞毒反应C．免疫复合物沉积激活补体引起组织损伤D．效应T细胞介导炎症反应和细胞毒作用Ⅳ型变态反应是
A．
B．
C．
D．
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属于体内药物分析样品的是（ ）
A.尿液 B.泪液 C.注射液 D.大输液 E.汗液
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按纽操作时（）
A . 缓慢一按到底
B . 快速一按到底
C . 缓慢点按
D . 快速点按
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以下战役，从战略意义上讲，作用相同的是（）。 ①萨拉托加大捷 ②斯大林格勒战役 ③莫斯科战役 ④刘邓大军挺进大别山 ⑤诺曼底登陆战役
A.①②③④⑤
B.①②④
C.③④⑤
D.①③④
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隧道衬砌采用湿喷混凝土时坍落度宜控制在（）。
\tA.50～60mm
\tB.60～80mm
\tC.80～100mm
\tD.80～120mm
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以下哪个显示了抗阻训练的的普遍顺序？（） 1.力量训练，核心联系，辅助训练； 2.核心力量，力量训练，辅助训练； 3.多关节训练，单关节训练； 4.小肌肉，大肌肉。
A.1，3和4
B.2，3和4
C.2和4
D.1和3
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