轨道交通车辆车轴为实心轴，高速动车组车轴为空心轴。

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答案

参考答案：对

阅读理解

While I was waiting outside my wife’s office building for her to get out of work, I saw a beggar coming my way from across the parking lot.

“I hope he doesn’t ask me for any money,” I thought.

He didn’t.He came and sat in front of the bus stop, but he didn’t look like he could have enough money to ride the bus. After a few minutes he spoke. “That’s a pretty car,” he said, pointing to my car. He was ragged (衣衫褴褛), but he had an air of dignity(尊严) about himself.

I gave him a smile and continued cleaning my car.

He sat there quietly as I worked. The expected asking for money never came. As the silence between us widened, it seemed that a voice inside me said, “Ask him if he needs any help.”

“Do you need any help?” I asked.

He answered in three simple but meaningful words that I shall never forget. We often look for wisdom in great men and women, and we expect it from those of higher learning and achievements. I expected nothing but a dirty hand from him, but he said three words that shook me.

“Don’t we all?” he said.

I was feeling high, successful and important above a beggar in the street, until those three words hit me like a shot.

Don’t we all?

I needed help. Maybe not for a bus fare or for a place to sleep, but I needed help. I reached in my wallet and gave him not only for a bus fare, but enough to get a warm meal and shelter for the day. Those three little words still ring true. No matter how much you have, no matter how much you have achieved, you need help, too. No matter how little you have, no matter how loaded you are with problems, even without money or a place to sleep, you can give help.