题目内容

信号继电器有着良好的（），可利用其接点构成各种控制和表示电路。

A. 指示性能
B. 开关性能
C. 报警性能
D. 提示性能

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铁路信号对继电器的要求表述错误的是（）。

A. 动作可靠、准确
B. 使用寿命长
C. 有足够的闭合和断开电路的能力
D. 不需要有稳定的电气特性和时间特性

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信号继电器由（）和接点系统两大部分组成。

A. 电磁系统
B. 动力系统
C. 开关部件
D. 连接部件

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Cet-6-1.12-Exercise 01H) What took place after World War II was not the revival of a 1920s economy, with its small farming units, urban manufacturing, and plurality of laborers. Instead, the 1950s saw the creation of a new suburban economy, with a plurality of white-collar workers. With an expanded transportation and communications infrastructure, businesses needed telephone operators, shipping clerks and similar occupations. If you could read, follow simple instructions, and settle into a routine, you could find a job in the post-war economy.

Attempts are being made to prevent hackers from carrying out identity theft.
B. The creation of a suburban economy in the 1950s created lots of office jobs.

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Cet-6-1.12-Exercise 02M) Using the latest Census Bureau data, Matthew Slaughter found that from 2000 to 2010 the real earnings of college graduates (with no advanced degree) fell by more in percentage terms than the earnings of high school graduates. In fact, over this period the only education category to show an increase in earnings was those with advanced degrees.

A. In the first decade of the 21st century, only people with postgraduate degrees experienced an increase in earnings.
Big banks have been reluctant to switch to more secure technology because of the higher costs involved.

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信号继电器有着良好的（），可利用其接点构成各种控制和表示电路。

A. 指示性能 B. 开关性能 C. 报警性能 D. 提示性能

铁路信号对继电器的要求表述错误的是（）。

信号继电器由（ ）和接点系统两大部分组成。

A. 指示性能
B. 开关性能
C. 报警性能
D. 提示性能

信号继电器由（）和接点系统两大部分组成。