问题
单项选择题
安装车刀时,其伸出长度不宜过长,否则在切削过程中容易产生振动。振动影响切削质量和操作安全,通常在车削外圆时,车刀伸出刀架部分的长度,一般为刀杆厚度的()。
A.1.5倍
B.2倍
C.2.5倍
答案
参考答案:A
安装车刀时,其伸出长度不宜过长,否则在切削过程中容易产生振动。振动影响切削质量和操作安全,通常在车削外圆时,车刀伸出刀架部分的长度,一般为刀杆厚度的()。
A.1.5倍
B.2倍
C.2.5倍
参考答案:A
选词填空。 | |
not 2______ people in the town, but every year, there are many 3______ and they like to stay in the special hotel. When you go into the hotel, the waiter or waitress will give you a 4______. The prices of the rooms are on it. But every room doesn't have a number, and its name is a person in a famous novel (小说). If you choose a name, for example. Holmes (福尔摩斯), the waiter will give you a bookmark. And the book mark is the key 5______ the room. After you open the door, you will feel surprised. Why? The room is furnishes (摆设) just like you are in the novel and you are working with Holmes. On the clothes tree 6______ Holmes' hat and his black cloak (披风). On the bed there is a big pipe (烟斗). It looks as if he left a few minutes ago and he will come back soon and you can talk with him 7______. Of course he will not come back. But you can sit in the room and read some books 8______ Holmes. It's very 9______, isn't it? 10______ time goes on, the hotel is getting more and more popular. You can see people all over the world in this hotel. |