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问题
判断题
爆炸危险场所使用的电缆和导线的额定电压不得低于500V．
答案
参考答案：
对
补全对话，情景问答
给下列的问句选择正确的答语。
( ) 1. Where does a fish live?
( ) 2. Where does a bird live?
( ) 3. Where does a snake live?
( ) 4. Where does a panda live?
( ) 5. Where does a cow live?
A. In a tree.
B. In a river.
C. On a farm.
D. In a forest.
E. In a hole.
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问答题 简答题
什么叫中性线？中性线的作用是什么？
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