问题
单项选择题
水准面处处与铅垂线______
A．垂直
B．平行
C．重合
D．斜交
答案
参考答案：A
解析：自由静止的水面，称为水准面，这个面是一个重力等位面，处处与重力方向线(铅垂线)正交。
搜题请搜索小程序“爱下问搜题”
水准面处处与铅垂线______
A．垂直
B．平行
C．重合
D．斜交
参考答案：A
解析：自由静止的水面，称为水准面，这个面是一个重力等位面，处处与重力方向线(铅垂线)正交。
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| Lucy bought shoes from shoe factory and tried to sell them to people. There were not many 1 in small villages. People there didn't want to go to town to buy their shoes. So Lucy 2 a lot of shoes there. One day Lucy 3 along the street. She stopped in front of a house. There was a small boy beside the door. Lucy opened the window of her lorry (运货汽车) and asked the boy, "Hello! Is your mother 4 ?" The boy looked at Lucy. Then he answered, "Yes, she is." "That's 5 ," Lucy said. She got out of the lorry, took some 6 and went to the door of the house. She 7 the door and waited for a few 8 , but nobody came to answer the door. Lucy knocked again and waited for a few more minutes, but 9 no one answered. Then Lucy looked at the boy and said 10 , "Your mother is not at home!" "She is!" the boy said. "Why didn't she open the door?" "This is not my house!" the boy shouted. | ||||
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