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【单选题】
正电荷q均匀地分布在半径为R的圆盘上，为方便用叠加原理计算通过并垂直盘面的轴线上任一点的电场强度，电荷元dq可取为： 【图片】A.
，( )
B.
，( )
C.
，( )
D.
，( )
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【单选题】Q: What does the man mean?
A.
He is not satisfied with the quantity.
B.
He doesn’t like the woman's suggest.
C.
He can accept 50% by L/C and the balance by D/
D.
He asks the woman whether she agrees to the payment terms.
【简答题】根据短文内容及首字母提示，填写所缺单词。 My name is Nick. My family is big. We often have a good time at the w 1 . My mother c 2 for us, but she doesn’t w 3 the dishes. My father washes the dishes. He also c 4 his car. S...
【简答题】根据下列条件，回答 3～12 题： 某宽厚板车间冷床区为三跨等高厂房，跨度均为35m：边列柱柱间距为1Om，中列柱柱间距为20m，局部60m：采用三跨连续式焊接工字形屋面梁，其间距为10m，屋面梁与钢柱为固接。厂房屋面采用彩色压型钢板，屋面坡度为1/20；檩条采用多跨连续式H型钢檩条，其间距为5m；檩条与屋面梁搭接。屋面梁、檩条及屋面上弦水平支撑的局部布置示意如题图中的(a)图所示，且系杆仅与檩条...
【简答题】根据下列句子及所给单词的首字母写出所缺单词。在填写答卷时，要求写出完整单词。 (每空限填一词) 小题1:He is very smart．He went to university at the a of 15． 小题2:Never cross the street when the traffic lights are r ．Wait until it’s green． 小题3:It doesn...
【简答题】Dear Sam， Thank you for your email． I’m visiting（参观）Beijing with my mother and my sister Kate now．My father John and my brother David don’t come with us．They are in New York．My father is a docto...
【简答题】根据句意和首字母提示填空，完成下列句子。 1. —How o_____ does your mother shop? —Twice a week. 2. I also like English. But math is his f _____ subject. 3. Some children often surf the I_____ with the help of their parents...
【单选题】条形图与柱形图的区别在于( )
A.
条形图是平面的，柱形图是立体的
B.
条形图是二维的，柱形图是三维的
C.
条形图数据各类别放在横轴，柱形图数据各类别放在纵轴
D.
条形图数据各类别放在纵轴，柱形图数据各类别放在横轴
【单选题】What is the main reason that someone said Britain and the United States are divided by a common language?
A.
British English and America English use different words and expressions to refer to the same thing.
B.
Britain and America are different in many aspects, though they speak the same language.
C.
British people and American people like different foods.
D.
Britain and America are separated by the Atlantic Ocean.
【单选题】What is the main reason that the man runs every day?
A.
To think out some difficult problems.
B.
To do some cross-country running.
C.
To finish a course in physical training.
D.
To keep fit and healthy.
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