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计算题：制氢装置生产中，烟气分析数据如下：CO2%：40；O2%：10求此时的空气过剩系数。

答案

参考答案：

用烟气分析数据计算a的公式如下：

a＝（100－CO2－O2）／（100－CO2－4.76O2）

式中CO2、O2分别是二者在烟气中的体积百分含量。分别将以上数据带入公式中有：

a＝（100-40-10）/（100-40-4.76×10）

＝50/12.4＝4.03

即此时的空气过剩系数为4.03。

多项选择题

某国际工程建设项目承包合同订立后，进入实施阶段。在施工过程中，即使承包商已经按照合同的要求办理了保险，在某些条件下，承包商仍应及时补办保险，这些条件是指（）。

A.预计将有风险发生

B.工程师认为有必要

C.业主认为有必要

D.工程延期

E.增加新项目
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单项选择题

"What does the middleman do but add to the price of goods in the shops " Such remarks are aimed at the intermediate operations between manufacturers and final customers. This practice usually attracts a lot of attention from the public and the press and the operation most talked about is what is often called wholesaling.The wholesaler buys goods in large quantities from the manufacturers and sells them in smaller parcels to retailers, and for this service his selling price to the retailer is raised several percent higher. But his job is made more difficult by retail demand not necessarily running level with manufacturers’’ production. Because he adjusts or regulates the flow of goods by holding stock until required, he frees the manufacturer, to some extent, from the effect on production of changing demand and having to bear the whole risk.The manufacturer can then keep up a steady production flow, and the retailer has no need to hold heavy stocks, who can call on the wholesaler for supplies any time. This wholesale function is like that of a valve in a water pipe. The middleman also bears part of the risk that would otherwise fall on the manufacturer and also the retailer.The wholesaler provides a purely commercial service, for which he is too well rewarded. But the point that is missed by many people is that the wholesaler is not just someone adding to the cost of goods. It is true one could eliminate the wholesaler but one would still be left with his function: that of making sure that goods find their way to the people who want them.

The middleman relieves the producer of________.

A．fluctuating market demand and staying at risk

B．the production of commodities for the retail market

C．some extent of production of changing demand

D．storing goods in a warehouse until they are needed
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