在选路时，控制台上进路排列表示灯先亮灯然后又灭灯，说明什么？

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问题问答题简答题

答案

参考答案：

正常时，说明进路已经选出，选岔电路工作正常。

补全对话，情景问答

( ) 1. — What did you do last holiday? 　　　 — I rowed a boat with my friend.	A.	B.
( ) 2. — What are you going to do on your holiday? 　　　 — I am going to see pandas. I love pandas.	A.	B.
( ) 3. — How did you go to Xinjiang last holiday? 　　　 — I went there by plane	A.	B.
( ) 4. — What did Bob do last weekend? 　　　 — He played football with his friends.	A.	B.

单项选择题

吸（）指在吸烟环境里被动吸烟。

A、烟

B、二手烟