调节阀的作用是什?

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问题:

调节阀的作用是什?

考点:电力生产“1000个为什么”锅炉运行与检修锅炉运行与检修题库
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土地使用强度是通过( )指标来控制的。

A.土地使用方式

B.容积率

C.建筑密度

D.容积率和建筑密度

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"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 author quite possibly believes that the function of the wholesaler is ______.

A.good but too costly

B.necessary but harmful

C.removable but necessary

D.acceptable but unnecessary

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膀胱刺激征是指()()()。

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计算负荷是一个假想的持续性负荷,其热效应与同一时间内实际变动负荷所产生的最大热效应( )。

A.差别很大
B.相等
C.不相等
D.无法比较

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流产失血导致月经不调,久不怀孕。其病在

A.冲脉、督脉
B.任脉、冲脉
C.阴维脉、阳维脉
D.阴跷脉、阳跷脉
E.阴跷脉、阴维脉

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