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问题 单项选择题

在初步可行性研究阶段，一般采用( )计算建设投资和生产成本。

A．指标估算法
B．比例估算法
C．系数估算法
D．生产能力指数法

答案

参考答案：A

解析： 初步可行性研究的深度介于投资机会研究和可行性研究之间，这一阶段一般采用指标估算法估算建设投资和生产成本。

选择题

黄河水土流失最严重的河段是[ ]

A、上游

B、中游

C、下游

D、中下游
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单项选择题

In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet.

Microwave communication uses high-frequency (29) waves that travel in straightlines through the air. Because the waves cannot (30) with the curvature of the earth, they can be (31) only over short distance. Thus, microwave is a good (32) for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or (33) . These can be installed on towers, highbuildings, and mountain tops.

33（）

A.repeaters 

B.radars 

C.telephones 

D.antennas
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