(C4) _______众课帮

急性时相反应蛋白升高的速度不同，______和α抗糜蛋白酶首先升高，在12小时内______也升高，然后______、______、C4和纤维蛋白原升高，最后是C3和Cp升高。

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C3植物和C4植物在结构上有__________区别。

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在Excel 2010 的工作表中，假定C4:C6 区域内保存的数值依次为5、9 和4，若C7 单元格中的函数公式为=AVERAGE（C4:C6），则C7 单元格中的值为________。

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等截面圆轴上装有四个皮带轮，合理安排应为D、C轮位置对调，这种方案是________的。（填合理或不合理）。929a5ec5b837768a7cdf5cbe44e712c4.png

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若矩阵与矩阵等价，则的关系是_______.570f13c0e4b0578413d483e5.gif5717618e712e5503e3e2e70f.gif8ee46e6d54269b410c4bee4bd2fde375.gif

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当___时，齐次线性方程组只有零解。.f638def7325c4e9bde4cc5649ee79c32.gif

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某系统的总体结构图如下图所示：该系统总体结构图的深度是______。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/3e6513e8b22c4ad79be28403b831d0a0.jpg

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刚体做定轴转动时，若，则刚体做_____。cb24d6bf093fec2b012c4a028578d4ae.png

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用Euler法求微分方程数值解，取步长，则的计算值为_______.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/624c4b8f8dca46c7bef22714e1ed1722.png

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设可微，求方程根的Newton迭代格式为_______.http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/0869779c4eed4519a2c8c5012d9580ea.png

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C4植物的蒸腾系数要______于C3植物的蒸腾系数。

C4植物的蒸腾系数要______于C3植物的蒸腾系数。

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HXD3C机车C4修检查要求接地开关接触板与主断路器的接地夹接触良好，接触长度不小于__mm（）

A．15 B．20 C．25 D．30

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HXD3C型电力机车受电弓（DSA200D型）C4修检查要求：空气滤清器__，作用良好（）

A．破损 B．堵塞 C．清洁 D．漏泄

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C4一双羧酸途径中将丙酮酸转变为磷酸烯醇式丙酮酸的酶是________。

A．丙酮酸激酶 B．PEP羧激酸 C．PEP羧化酶 D．丙酮酸磷酸二激酶

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一种化合物的分子式为C4H2O，写出与下面质谱峰相对应的离子和化合物的结构式。m/z72为________，m／z44为______，m／z29为__________，化合物为________。

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在Excel工作表中，单元格C4中有公式“ =A3＋$C$5 ”，在第三行之前插入一行之后，单元格C5中的公式为在Excel工作表中，单元格C4中有公式“ =A3+$C$5 ”，在第三行之前插入一行之后，单元格C5中的公式为______

A．=A3+＄C＄6 B．=A4+＄C＄5 C．=A3+＄C＄5 D．=A4+＄C＄6

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To understand the marketing concept, it is only necessary to understand the difference between marketing and selling. Not too many years ago, most industries concentrated primarily 【C1】______ the efficient production of goods, and then relied on " 【C2】______ salesmanship" to move as much of these goods as possible. Such 【C3】______ and selling focus on the needs of the seller to produce goods and then 【C4】______ them into money.

Marketing, on the other hand, focuses on the wants of consumers. It begins with first analyzing the 【C5】______ and demands of consumers and then producing goods that will satisfy them. This eye-on-the-consumer approach is known as the marketing concept, which 【C6】______ means that instead of trying to sell whatever is easiest to produce or buy for resale, the makers and dealers first endeavor to find out what the consumer wants to buy and then go about making it available for purchase. This concept does not imply that business is benevolent or that consumer satisfaction is given priority over profit in a company. There are always two sides to every business transaction—the firm and the customer—and each 【C7】______ satisfied before trade occurs. Successful merchants and producers, however, recognize that the surest route to profit is through understanding and catering to customers. A 【C8】______ example of the importance of catering to the consumer presented itself in mid-1985, when Coca Cola changed the 【C9】______ of its drink. The non-acceptance of the new flavor by a significant portion of the public 【C10】______ a prompt restoration of the Classic Coke, which was then marketed alongside the new. King Customer ruled! 【C1】______ A．on B．with C．to D．towards

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In 1971 there were about 3,700 million people in the world. If the population were 【C1】______ evenly over the earth' s surface there would be about 50 people to the square mile; but there are vast areas of desert and mountain and tropical forest 【C2】______ are uninhabited, 【C3】______ at the other 【C4】______ , in the great cities millions may live within a few square miles.

【C5】______ of the world' s population is concentrated on only a small 【C6】______ of the earth' s land surface, in the rich valleys and 【C7】______ plains, because people up to the present time have 【C8】______ to congregate in place where the climate and soil make it easy to grow food and obtain shelter. A 【C9】______ world population and the discoveries of science 【C10】______ this pattern of distribution in the future. As men slowly learn to master diseases, control floods, prevent famines, and stop wars, fewer people die every year; and in 【C11】______ the population of the world is steadily 【C12】______ . When numbers 【C13】______ , the extra mouths must be fed. New lands must be brought 【C14】______ cultivation, or land already 【C15】______ , made to yield larger crops. In some areas the accessible land is largely so intensively cultivated 【C16】______ it will be difficult to make it 【C17】______ more food. in some areas the population is so dense that the land is divided into. units 【C18】______ tiny to allow for much improvement in farming methods. 【C19】______ a large part of this farming population drawn 【C20】______ into industrial occupations, the land might be farmed much more productively by modern methods. 【C1】______ A．scattered B．restrained C．separated D．resembled

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在Excel中，如果将A2单元格中的公式"=B2*$C4"复制到C8单元格中，该单元格公式为________。

A．=B2*$C4 B．=D8*$C10 C．=D8*$C4 D．=D8*$E10

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巳知工作表中C3单位与D4单元格的值均为0，C4单元格中为公式"=C3=D4"，则C4单元格显示的内容为_________。

A．A.C3=D4 B．B.真 C．C.N/A D．D.0

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在Excel2003工作表中，单元格D5中有公式“=$B$2+C4”，删除第A列后，C5单元格中的公式为：____。

A．=$A$2+B4 B．=$B$2+C4 C．=$A$2+C4 D．=$B$2+B4

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一种化合物的分子式为C4H8O，写出与下面质谱峰相对应的离子和化合物的结构式。m/z72为______，m/z44为______，m

一种化合物的分子式为C4H8O，写出与下面质谱峰相对应的离子和化合物的结构式。m/z72为______，m/z44为______，m/z29为______，化合物为______。