问题
单项选择题
使用Ⅰ类手持电动工具必须选择漏电动作电流不大于（）毫安，动作时间不大0.1S的漏电保护。
A、15
B、30
C、50
D、100
答案
参考答案：B
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使用Ⅰ类手持电动工具必须选择漏电动作电流不大于（）毫安，动作时间不大0.1S的漏电保护。
A、15
B、30
C、50
D、100
参考答案：B
| 选择方框内所给的单词并用适当形式填空。 | |
see animals, but a small cage isn't a good place for an animal to live in. Today, zoos keep animals in 3______ kinds of cages. The cages are very big and 4______. The cages look like the 5______ habitats. Zoos help to protect animals, They protect animals in the zoo and they protect animals in the 6______. How do they do this? Zoos teach people how animals live in the wild. Zoos want people to help 7______ the "wild habitats". Many plants and animals are going extinct. 8______ say that seventy-four kinds of 9______ things go extinct every day! Zoos are working together to 10______ animals from going extinct. |