问题
判断题
安全距离是由绝缘水平、带电作业时过电压水平以及必须的安全裕度三种因素决定的
答案
参考答案：对
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安全距离是由绝缘水平、带电作业时过电压水平以及必须的安全裕度三种因素决定的
参考答案：对
| 完形填空。 | |||
| Mark has a big garden, and it is very nice. There 1________ some tall trees and beautiful flowers in the garden. Many birds like 2________ in it. They often sing and dance there. Beside the trees and flowers, there is a small lake. Mark usually 3________ games with his friends in the garden. His parents likes fishing 4________ the lake. What about Mark's cat? 5________ sometimes sleeps in the trees, sometimes plays with a ball under the trees.
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