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听力原文: Thank you for coming to this meeting for students who will be remaining on campus daring the 10- day winter break. As the dean of students, it is my responsibility to explain the vacation arrangements and to have you fill out forms giving the dates you will be on campus. To reduce heating costs, Butler Hall will be the only dormitory open. All the other dorms will close at 5:00 p, m. on Friday, Feb. 7 and will not reopen until 6:00 p, m. on Feb, 16. Once we have your completed forms, we will assign you a room in Butler Hall. Please move all the belongings you will need to your temporary accommodations by the 7th, as it will not he possible to reopen the other dorms during these ten days once they've been closed. Most college facilities will be closed during the vacation. These facilities include the gymnasium, the college store, and the dining halls. The library and the Computer Center will be open, though on a reduced schedule. Only the post office and the college administration offices will maintain their regular hours. Since I imagine most of you are staying here to finish up academic projects of one sort or another, let me wish you luck with your work. If you have any special problems, please do not hesitate to contact me at the dean's office. (33)
A.
Those who will be on campus during a vacation period.
B.
Those who work part-time in the administration offices.
C.
Those who normally live in Butler Hall.
D.
Those who will be moving on campus in a few minutes.
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【单选题】在右手螺旋法则中,以()竖起的方向表示电流的方向,其余四指弯曲,则四指弯曲的指向就是电流磁场的方向
A.
右手拇指
B.
右手中指
C.
右手食指
D.
左手拇指
【单选题】下列哪些不是基准物应该具备的条件()
A.
纯度足够高
B.
稳定性好
C.
有确定的化学式
D.
不能含有结晶水
E.
最好具有较大的摩尔质量
【判断题】设 为可导函数且满足 , 则曲线 在点 处的切线斜率为 。( )
A.
正确
B.
错误
【简答题】光纤的主要原料是什么? 光纤有哪几部分组成?各部分的尺寸和作用分别是什么?
【单选题】设 为可导函数且满足 ,则曲线 在点 处的切线斜率为( )
A.
2
B.
-1
C.
1
D.
-2
【简答题】光纤有哪几部分组成?
【判断题】设 为可导函数, 且满足 ,则曲线 在点 处的切线的斜率 .
A.
正确
B.
错误
【简答题】光纤的组成部分有哪几种?
【单选题】在右手螺旋法则中,以()竖起的方向表示电流的方向,其余四指弯曲,则四指弯曲的指向就是电流磁场的方向。
A.
右手拇指
B.
右手中指
C.
右手是指
D.
左手拇指
【单选题】设 为可导函数且满足 ,则曲线 在点 处的切线斜率为( )
A.
1
B.
- 1
C.
2
D.
- 2.
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