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【简答题】
任务型阅读。 Dear Mary: I saw your name in the newspaper, you asked for penfriends in China. I would like to be your penfriend. I am a thirteen - year - old boy. I live in Nanjing. I am a student at No.1 Secondary School. We study Chinese, English, Maths, Science, Art, PE and some other subjects. My favorite subjects are Maths and PE. I like playing the guitar, collecting stamps and taking photos. I like summer best because my favourite sport is swimming. My family is not big. My grandfather, my father, my mother, and I live a happy life here. My father is an engineer, my mother is a doctor. My grandfather was a policeman and now he is retired (退休). We live in an old house. Near our house, there is a beautiful park. Our family often take a walk in the park after supper. I would like to know something about you and the UK. Please write to me soon. My e-mail address is yurun@163.com . My fax and telephone number is 86-25-82011853. Yu Run Yu Run's profile 1.________ 2.________ 3.________ 4.________ 5.________ 6.________ 7.________ 8.________ 9.________ 10.________
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【单选题】对于确定扭矩T符号的右手螺旋法则,此叙述正确的是()
A.
按右手螺旋法则把T表示成矢量,当矢量方向与截面外法线方向相反时,T为正
B.
按右手螺旋法则把T表示成矢量,当矢量方向与截面外法线方向相反时,T为负
C.
按右手螺旋法则把T表示成矢量,当矢量方向与截面外法线方向相同时,T为正
D.
以上说法都不对
【单选题】利用非线性器件相乘作用来实现频率变换时,其有用项为( )
A.
A、一次方项
B.
B、二次方项
C.
B、三次方项
D.
D、全部项
【单选题】利用非线性器件相乘作用来实现频率变换时,其有用项为( )
A.
、一次方项
B.
二次方项
C.
高次方项
D.
全部
【简答题】This is the only party that I (enjoy)______in my life really.
【单选题】啤酒中含有丰富的( )。
A.
维生素A
B.
维生素B族
C.
维生素C
D.
维生素E
【单选题】啤酒中含有丰富的( )。
A.
维生素 A
B.
维生素B
C.
维生素C
D.
维生素E
【多选题】《补贴与反补贴措施协议》将专项性补贴分为( )
A.
直接补贴
B.
禁止性补贴
C.
可诉性补贴
D.
间接补贴
E.
不可诉性补贴
【单选题】利用非线性器件相乘作用来实现频率变换时,有用项为 ( )
A.
一次方项
B.
二次方项
C.
高次方项
D.
全部项
【判断题】线性规划的最优解一定是基本最优解。
A.
正确
B.
错误
【单选题】利用非线性器件相乘作用来实现频率变换时,其有用项为( )
A.
一次方项
B.
二次方项
C.
高次方项
D.
全部项
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