问题
单项选择题
铣床上钻小孔时，由于孔壁与钻头摩擦剧烈，易造成钻头折断，所以可将顶角稍磨偏些，使孔径略（）钻头直径。
A.大于
B.小于
C.等于
D.小于或等于
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
铣床上钻小孔时，由于孔壁与钻头摩擦剧烈，易造成钻头折断，所以可将顶角稍磨偏些，使孔径略（）钻头直径。
A.大于
B.小于
C.等于
D.小于或等于
参考答案：A
| 完形填空。 | ||||
| A white woman took a plane to New York. When she got on the plane, she found a black man sitting next to her seat. She was unsatisfied with this, so she 1 the stewardess(空中小姐). Soon the stewardess came. " Madam, what is the matter?" she asked. " Don't you see it?" the woman said. " You placed me next to a 2 . I do not agree to sit next to someone from such a disgusting group. Give me a different__3 ." " Be calm, please," the stewardess said. " Almost all the seats on this flight are taken. 4 will go to see if another place is available. " The stewardess went away and then came back a few minutes 5 . "Madam, just as I thought, there are no 6 seats in the economy class(经济舱). I spoke to the captain and he told me that there is 7 no free seat in the business class(商务舱). But we have one seat in the first class (头等舱). " 8 the woman could say anything, the stewardess 9 . “It is not usual for our company to allow someone from the economy class to sit in the first class. However, the captain feels that it would not be good to make someone sit 10 someone so disgusting. " She turned to the black man, and said, "For that reason, Sir, if you would like to, please take your bag because a seat is waiting for you in the first class. " At the moment, the other people on the plane stood up and hit their hands together and cheered. | ||||
|