问题
单项选择题
在温度分别为237℃和27℃的高温热源和低温热源之间工作的热机，理论上的最大效率为( )。
A．20%
B．25%
C．30%
D．40%
答案
参考答案：D
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在温度分别为237℃和27℃的高温热源和低温热源之间工作的热机，理论上的最大效率为( )。
A．20%
B．25%
C．30%
D．40%
参考答案：D
Is music enjoyed simply for being a nice little tune? No, there are things 1 important to learn about than whether you really like the song, for example, the story of the singer himself. Many singers had had hard 2 before they became famous. Xiao Huangqi, a pop singer and songwriter from Taiwan, is one of them. Up till now, he has made five albums (唱片) and 3 several music awards. Among his hit songs, the most popular one is “You Are My Eyes”, a song that 4 his own true story, a blind man who loves music and the world so much. Xiao was born blind. At the age of four, he got some eyesight through an operation. He couldn’t be 5 because he could see the world with his own eyes. He began to practice Judo (柔道) and learned to play the saxophone (萨克斯管) and the guitar. But fate(命运) 6 him. He became blind again ten years later because he had used his eyes too much. It was a great blow. But Xiao is so 7 and optimistic(乐观) that he soon got out of his sadness. He began writing songs and found a colorful world within. He hears and feels the world and 8 his thoughts and feelings into music. “When one door closes, another door opens.” 9 opened the door for Xiao and has 10 him into a wonderful and colorful world.
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