问题
单项选择题
公称压力为6.3MPa的液压泵，其出口接油箱。则液压泵的工作压力为（）。
A、6.3MPa
B、0
C、6.2Mpa
答案
参考答案：B
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公称压力为6.3MPa的液压泵，其出口接油箱。则液压泵的工作压力为（）。
A、6.3MPa
B、0
C、6.2Mpa
参考答案：B
| On the day that Benjamin Franklin was seven years old, his mother gave him 1 pennies. It was the first money that he had ever had. "You 2 buy something, if you wish," said his mother. The little fellow ran into the street. As Benjamin ran down the street, he 3 what he should buy. Should he buy candy? Should he buy a pretty toy? He had never owned a good toy. He met a larger boy, 4 was blowing a whistle. What a pretty sound! "I wish I 5 that whistle," he said. Benjamin gave all his pennies to the boy to buy the whistle. Little Benjamin was very happy. He ran home 6 he could. "See, mother," he said, "I have bought a whistle." "How much did you 7 it?" "All the pennies you gave me." "You've paid a dear price for this thing. It's only one penny whistle. You might have bought half a dozen such whistles with the money I gave you," said his mother. The little boy saw what a mistake he had made. He threw it upon the floor and began to cry. "Never mind, my child," said his mother, very kindly. "You are only a very little boy, and you will learn a great deal as you grow bigger. The 8 you have learned today is never to pay too dear for a whistle." Benjamin Franklin lived to be a very old man, but he 9 forgot that lesson. Everyone should remember the name of Benjamin Franklin. He was a great thinker and a great doer, and 10 Washington he helped to make USA free. | |||
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