高、低电缆在巷道同一侧敷设之间的距离不得小于（）mm。
A、100
B、150
C、200
D、250
参考答案：A
请读句子，按需要填上a或an。
1. This is ____________ English hoy. He is ____________ student.
2. There is ____________ orange and ____________ pear on the table.
3. There is ____________ red apple in my bag. Would you like ____________ apple?
4. That's ____________ old lady. She is ____________ farmer.
5. What's this? It's ____________ tiger. It's ____________ big tiger.
以下不属于铁塔集中修项目的是（）。
