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问题 填空题

弯曲菌属细菌为微需氧菌，初次分离时，多数种类的弯曲菌需在含____O、__C0和____N2的气体环境中生长。

答案

参考答案：5%；10%；85%

单项选择题

C


Americans use more water than any other people in the world. If we continue to use water at the rate we do now, we will soon not have enough to meet our needs. In 1980, 40 billion gallons were used each day in the United States. In 1990, 700 billion gallons were used. The average Americans use almost 90 gallons of water a day for personal use. And much move water is needed to make the things American people like to have. For example, it takes thousands of gallons of water to make one pound of beef for the dinner table. It takes more than 100000 gallons of water to make a car. If we include these uses of water, the average American uses about 2000 gallons of water a day．

The best title for the passage is ______.

A．Water Use in the United States

B．The Problem of Water Use

C．Water Use in the World

D．Water Use in the Twentieth Century
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单项选择题 案例分析题

综合布线系统，根据《综合布线系统工程设计规范》GB50311-2007，在6～10题中选择正确答案。

某楼层配线间连接数据信息点110点，数据干线采用光缆，按照每台数据交换机（每台交换机按照24口计算）设置1个主干端口，再考虑备份，干线应设（）芯光缆。

A.6

B.8

C.14

D.16
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