什么叫工具面？什么是高边？_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题问答题简答题

什么叫工具面？什么是高边？

答案

参考答案：

（1）工具面：在造斜钻具组合中，弯曲段的两条轴线相交所决定的平面。

（2）高边：井底的圆面不是水平的，圆周上的最高点就是高边。

阅读理解

Most visited museums in the world

The British Museum, London, UK
It is one of the world’s greatest museums of human history and culture. It was opened on Jan 15, 1759. And now it has about 8 million things, from the stone tools of early men to 20^th century inventions. Some famous inventions are on show there, such as the bicycle, the telephone, the television and so on.

Musee du Louvre, Paris, France
It was first built in 1204, but as a museum, it was opened in 1793. Once a palace that was homes to kings of France, the Louvre is now the world’s most famous museums. Millions of visitors go to the museum every year. It’s famous for some of the best pieces of art in the world.

The Metropolitan Museum of Art, New York, US
The museum is one of the world’s largest museums. It was opened in 1872. There are over 2 million things of art. You can see many interesting things from Africa and the Middle East. Of course, it has a great collection of American art. If you are interested in American history, don’t miss it.

小题1:How many things are there in the British Museum now ?

小题2:When was Musee du Louvre opened as a museum?

小题3:In the passage, we know the Metropolitan Museum of Art is __________.

A．in New York

B．once a palace

C．not interesting

D．famous for science

单项选择题

气管内一次吸痰时间应限制在（）。

A.5秒以内

B.10秒以内

C.15秒以内

D.20秒以内

E.30秒以内