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问题 单项选择题

系统出现谐振过电压时，三个相电压表发生剧烈摆动，有时出现一相降低、二相升高，有时出现（），线电压表也发生（）。

A、三相同时降低；指示升高

B、三相同时降低；指示降低

C、三相同时升高；指示升高

D、三相同时升高；指示降低

答案

参考答案：C

单项选择题

当SCON寄存器值为40H时，串行口工作方式为（）

A、同步移位寄存器方式，串口禁止接收

B、8位UART方式，串口禁止接收

C、9位UART方式，串口禁止接收

D、8位UART方式，串口允许接收
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单项选择题

A public-service advertisement advises that people who have consumed alcohol should not drive until they can do so safely. In a hospital study, however, subjects questioned immediately after they consumed alcohol underestimated the time necessary to regain their driving ability. This result indicates that many people who drink before driving will have difficulty following the advertisement’s advice.
Which of the following, if true, most ply supports the argument above

A．Many people, if they plan to drink alcohol, make arrangements beforehand for a nondrinker to drive them home.

B．The subjects in the hospital study generally rated their abilities more conservatively than would people drinking alcohol outside a hospital setting.

C．Some people refrain from drinking if they will have to drive to get home afterward.

D．The subjects in the hospital study were also questioned about the time necessary to regain abilities that do not play an important role in driving safely.

E．(E) Awareness of the public-service advertisement is higher among the general population than it was among the subjects in the hospital study.
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