中型沼气工程的厌氧发酵池单池的容积为多少立方米？

The firemen _____ the fire as soon as they got to burning buildings.[ ]

A. put up

B. put away

C. put out

D. put down

Communications technology factors that can affect the project include all of the following EXCEPT______．

A．the length of the project

B．the availability of technology

C．executive requirements

D．the urgency of the need for information

有一项年金，前3年无现金流入，后5年每年年初流入500万元，假设年利率为10%，其现值为( )万元。

A．1994.59

B．1566.44

C．1813.48

D．1423.21

热油管道沿途温降是（）。

A.逐渐变快

B.逐渐变慢

C.不变的

D.一致的

电信企业必须首先确定其目标沟通对象，即确定（）。