问题
单项选择题
汽车由高速挡换入低速挡，变速器输出轴的转速和扭矩变化情况是
A．转速增大、扭矩减小
B．转速降低、扭矩增大
C．转速增大、扭矩增大
D．转速降低、扭矩减小
答案
参考答案：B
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汽车由高速挡换入低速挡，变速器输出轴的转速和扭矩变化情况是
A．转速增大、扭矩减小
B．转速降低、扭矩增大
C．转速增大、扭矩增大
D．转速降低、扭矩减小
参考答案：B
Once there was a father and a son. They were ill-tempered(坏脾气的) and never gave way to others. One day the father decided to _46___some friends to dinner in his house. He __47____ his son to buy some meat in town. When the son got _48____his father wanted, he turned back and walked towards the town gate. Just then a man was coming from the outside. The gate wasn’t __49___enough to let two men in and out at the same time. But __ 50 of them  would give way to the other. They___51___ straight face to face inside the gate hour after hour. But the father was worried. " What shall I do? My son hasn’t____52___ yet. I can’t wait any longer.” He wanted to know what the ___53____ with his son was. So he left his friends at home, and he himself went to the town to look for his son.“You may first take the ___54_____ home for my friends. Let me stand here against him ____55____.” He said to his son when he knew what had happened.
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