问题
单项选择题
矿山安全技术
( )是单位体积空气具有的对外做功的机械能所呈现的压力，是风流质点热运动撞压器壁面而呈现的压力。
A．静压
B．位压
C．动压
D．全压
答案
参考答案：A
解析：静压是单位体积空气具有的对外做功的机械能所呈现的压力，是风流质点热运动撞压器壁面而呈现的压力，包括绝对静压和相对静压。
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矿山安全技术
( )是单位体积空气具有的对外做功的机械能所呈现的压力，是风流质点热运动撞压器壁面而呈现的压力。
A．静压
B．位压
C．动压
D．全压
参考答案：A
解析：静压是单位体积空气具有的对外做功的机械能所呈现的压力，是风流质点热运动撞压器壁面而呈现的压力，包括绝对静压和相对静压。
On a cold evening I was waiting for a taxi in New York. About 5 minutes later, I was picked up by a driver, and he said how terrible some people were. I knew there was a part of me that wanted to be silent, but I had to  listen out of kindness. The man told me that he had just come from JFK Airport without a customer. Over the courses of that taxi ride, what started as anger changed slowly and he mentioned that he had read an article which said that the happiest people are the ones that give, so he hoped he’d have more chance to give in his life. I was really starting to enjoy being with this man. As we arrived at the place where I wanted to go, I paid my money by credit card. I pulled out an extra $20 and said, “Sir, since we’ve been talking about giving this whole time, I want to share that feeling with you. I’ve already paid my money, but here’s an extra little bit.  You can tell the next passenger in this taxi that their ride is a gift from another.”I thought I was pretty cool at this point, but he turned toward me, tears in his eyes, and said, “Sir, I have a better idea. You give that $20 to a homeless person around here and I will give the next passenger a free ride myself. It was a great honor meeting that man and learning the lesson of how everyone gives and adds joy to another with their generosity. 小题1:According to the text, when the author got in the taxi, the driver was .
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