问题
单项选择题
一般，在滚齿机上滚切直齿圆柱齿轮可以不用（）传动链。
A.主运动
B.展成运动
C.轴向进给
D.差动运动
答案
参考答案：D
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一般，在滚齿机上滚切直齿圆柱齿轮可以不用（）传动链。
A.主运动
B.展成运动
C.轴向进给
D.差动运动
参考答案：D
In this early day of the United States of America, it wasn’t easy ____ from one town or city to _____. There were no trains. Of course, and the roads were very poor. If a man wanted to go from one place to another, he often _____ a horse. And because the roads were bad, he sometimes got very dirty. One day a man came into a hotel in a little country town. His clothes were very dirty, and he looked very tried. “ Do you have a room here _____ me?” he asked. The hotel man at the desk thought, “ I don’t want this man ____ here. He’s too dirty for my hotel.” “ I’m sorry.” He said. “ We don’t have any ___ rooms. There’s a small hotel down the street. You can ask there.” Soon an important-looking man having fine clothes came into the hotel. “ I’ve come to see Mr. Jefferson,” he said. “ Mr. Jefferson?” “ Yes, Vice-president(副总统) Jefferson. We planned to meet here.” The hotel man was ____ “ A man _____ dirty clothes was just here. I thought he was a farmer, and sent him to another hotel a few minutes ago.” The hotel man _____ the Vice-president’s room in the other hotel. “ Oh, Mr. Jefferson,” he said, “ I’m very sorry I thought you were a farmer. We have a room at our hotel. Please come back.” “ No.” said Mr. Jefferson, “ If there’s no room for a farmer, there’s no room for the Vice president, _____.”
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