按控制原理的不同，机电一体化伺服系统可分为（）、闭环和半闭环等伺服系统。 - 查题网

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高等继续教育 / 机电一体化系统设计

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按控制原理的不同，机电一体化伺服系统可分为（）、闭环和半闭环等伺服系统。

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机电一体化系统设计

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8、John lives alone because his wife died. He works hard all his life, _ _ _ 21 _ _ _ he is very poor. Now he is so old that he can't work. He has three sons, but they are married, and they are very busy. They only have time to eat dinner with their _ _ _ 22 _ _ _ once a week. The old man grows older and older, and his sons come to see him less and less. “They don't need me at all now,” he tells himself. They are afraid I'll become a burden. Then he makes a plan. The next morning, he finds a large box, fills _ _ _ 23 _ _ _ lots of broken pieces of glass, and then locks it with an old lock. In the afternoon, his sons come for dinner. They find the box. “What's in this box?” they ask. “Oh, nothing,” the old man says. “It must be full of gold,” they think. So they want to guard the treasure. They decide _ _ _ 24 _ _ _ with the old man. They can look after him, too. This goes on for _ _ _ 25 _ _ _ . At last, the old father dies. The sons give him a very nice funeral. After the funeral, they open the box. They find it full of broken glass. There is a note on the glass: Honor your father and mother.统考英语完型填空