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问题 单项选择题

滴灌技术的优点除提高土地利用率、节省机力费、经济效益、社会效益、生态效益、节省劳动力、提高劳动生产率、防止盐清化，以外还有哪些优点（）。

A.增产、节水、节肥、提高品质

B.增产、节水、节肥

C.节水、增产、提高品质

答案

参考答案：A

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 wholesaler regulates the flow of goods by ______.

A．running level with manufacturers’ production

B．holding down stock of commodities

C．keeping stock for per demand

D．adjusting the prices of goods in time
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单项选择题

关于心脏射血的叙述，错误的是

A．血液射人动脉依赖于心室收缩
B．房室瓣关闭依赖于室内压高于心房压
C．房室瓣开放依赖于心房收缩
D．心室充盈主要依赖心室舒张的抽吸作用
E．左右心室的搏出量基本相等
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