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问题 多项选择题

对产品构思进行筛选应从两方面考虑：一方面要考虑市场需求量、价格、质量要求、竞争情况、技术趋向和客户意见等外部因素；另一方面要考虑（）、销售能力等内部因素。

A、企业资金

B、技术水平

C、设备能力

D、管理水平

答案

参考答案：A, B, C, D

单项选择题

非水消防系统不包括______。

A．干粉灭火系统
B．泡沫灭火系统
C．二氧化碳灭火系统
D．二氧化氮灭火系统
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单项选择题

Throughout the 19th century and into the 20th, citizens of the United States maintained a bias against big cities. Most lived on farms and in small towns and believed cities to be centres of (1) , crime, poverty and moral (2) Their distrust was caused, (3) , by a national ideology that (4) farming the greatest occupation and rural living (5) to urban living. This attitude (6) even as the number of urban dwellers increased and cities became an essential (7) of the national landscape. Gradually, economic reality overcame ideology. Thousands (8) the precarious (不稳定的) life on the farm for more secure and better paying jobs in the city. But when these people (9) from the countryside, they carried their fears and suspicions with them. These new urbanities, already convinced that cities were (10) with great problems, eagerly (11) the progressive reforms that promised to bring order out of the (12) of the city.

One of many reforms came (13) the area of public utilities. Water and sewerage systems were usually operated by (14) governments, but the gas and electric networks were privately owned. Reformers feared that the privately owned utility companies would (15) exorbitant (过渡的) rates for these essential services and (16) them only to people who could afford them. Some city and state governments responded by (17) the utility companies, but a number of cities began to supply these services themselves. (18) of these reforms argued that public ownership and regulation would (19) widespread access to these utilities and guarantee a (20) price.

（18）（）

A.Proponents

B.Opponents

C.Sponsors

D.Rivals
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