阅读对话，判断下列句子正“T”误“F”。

Tom: Mum, I want to go on a trip to Shijiazhuang. Can we go by plane?

Mum: No, Tom. It costs too much. Let's take a bus.

Tom: No, Mum, a bus is too slow.

Mum: Okay. Let's take a train. It's cheaper than a plane and faster than a bus.

Tom: All right! Let's take a train.

( ) 1. Tom wants to go to Shijiazhuang.

( ) 2. Tom can go there by plane.

( ) 3. Mum wants to go by bus.

( ) 4. A train is cheaper than a plane.

( ) 5. A bus is faster than a train.

跌落式熔断器主要用于架空配电线路的支线、用户进口处，也用作配电变压器一次侧、电力电容器等设备作为（）。

A、过载或接地保护

B、接地或短路保护

C、过载或低电压保护

D、过载或短路保护