问题 多项选择题

某城市排水工程,A部门的主要工程是修建排水泵站,是为了将污水或雨水进行提升,最终送到污水处理厂。负责人要求在格栅设置时,将格栅斜角度定为60°,格栅工作台采用封闭式的,因为主泵选用1台轴流泵,2台混流泵,2台离心泵和1台潜水泵,所以决定采用手动单梁起重机,溢流井的位置设在来水管进水闸之后,且溢流,的高度要随洪水位的变化而变化。

排水泵站的集水池主要作用是起调节水量,集水池容积应根据进水管的设计流量、水泵抽升能力、( )以及进泵站前的下水道是否可能作为调蓄容积而定。

A.水泵启动方式

B.启动时间

C.开停次数

D.池的水力条件

E.水泵储水容积

答案

参考答案:A,B,C,D

连线题
单项选择题

American Museum of Natural History is one of the largest natural and historic museums in the world and one of the main natural history research and education centres in the United States, set up in 1869 and located in the west of the Central Park, Manhattan District, New York. It (1) 7 hectares in its total area, (2) classical types of buildings. The (3) of ancient creatures and humanity is (4) the first place of all the museums in the world, (5) the representative samples from South America, Africa, Europe, Asia and Australia were collected, besides those from the (6) country, the United States.In the museum, there are five kinds of exhibits, including astronomy, mineralogy, human history, and animals in the (7) times and those in modern times. There are thirty-eight exhibition halls with different (8) from 500 to 1,500 square metres. Besides these, there is a Roosevelt Memorial Hall in (9) of President Roosevelt who supported the (10) of the museum, which is also used to have a special exhibition, showing the new important (11) on natural sciences and (12) affairs and social problems, and special topics connected closely with the life of the citizens. Besides this, it is also used for avocation (13) to have all kinds of scientific activities in the laboratories, centres of natural science and centres for citizens. There are more than 10 (14) research departments mainly(15) for collection of samples, research and work of publication.In the museum, there are (16) and sub-libraries of Aulspond ancient amniote, with about 300 thousand books and magazines (17) natural history, many of(18) are very valuable monographs for the first edition. It has published many expert books and magazines, and a large number of propaganda materials, (19) which are the two magazines, Natural History and Members of Museum that have the biggest (20) of their magazines.

14()

A.subject

B.declaration

C.course

D.rehearsal