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问题 多项选择题

晶闸管换流阀的运行触发角工作范围的优化选择应考虑哪些因素。（）

A.满足额定负荷、最小负荷和直流降压等各种运行方式的要求

B.满足正常启停和事故启停的要求

C.满足交流母线电压控制和无功调节控制等要求

D.以上都不是

答案

参考答案：A, B, C

填空题

Here are little cars that may some day take the place of today’s cars. If everyone drives such a car in the future, there will be less pollution in the air. There will also be more parking spaces in cities, and the streets will be less crowded. Three such Cars fit in the space now needed for one Car of the usual size. The little cars will cost much less to own and to drive. Driving will be safer, too, as these little cars can go only 55 miles per hour. The Cars of the future will be fine for getting around a city, but they will not be useful for long trips.

What is the passage talking about （）
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单项选择题

驾驶机动车行经市区下列哪种道路时不得超车？

A．主要街道

B．单向行驶路段

C．单向两条行车道

D．交通流量大的路段
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