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【简答题】
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 yuren@163.com.My fax and telephone number is 86-25-82011853. Yu Run Yu Run’s profile Name Yu Run Age 小题1: Telephone and fax number 86-25-82011853 小题2:of the school No.1Secondary School 小题3:subjects Maths and P.E. Hobbies Playing the guitar 小题4:stamps and taking photos Favourite sport I like swimming小题5: Favourite season 小题6: Family 小题7: There are 小题8:people in the family. Grandfather, father, and mother who works in a小题9: 小题10: yuren@163.com
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【简答题】下列有关骨、关节、肌肉三者间关系的模式图中正确的是( )
【单选题】将外部中断0设置为电平触发的语句是( )。
A.
IT0=1;
B.
IT0=0;
C.
EX0=1;
D.
EX0=0;
【单选题】设置外部中断0为电平触发方式。下列设置语句正确的是()。
A.
IT0=0;
B.
IT0=1;
C.
IT1=0;
D.
IT1=1;
【单选题】外部中断0和外部中断1有两种引起中断的方式,一种是下降沿引起中断,另一种是低电平引起中断。当需要设置外部中断1为下降沿触发中断时,则应设置( )
A.
IT0
B.
IE1
C.
IT1
D.
IE0
【单选题】下列有关自由基的说法中错误的是()
A.
自由基是独立游离存在的带有不成对电子的分子、原子或离子
B.
自由基主要是由于化合物的离子键发生均裂而产生的
C.
当体内自由基产生和清除失去平衡就会使机体处于氧化应激,造成机体的损害
D.
都具有顺磁性、化学性质活泼、反应性高、半衰期短的特点
【单选题】气缸盖出现哪种损伤必须更换()。
A.
裂纹
B.
磨损
C.
变形
【单选题】下列有关自由基的说法中错误的是
A.
A自由基是独立游离存在的带有不成对电子的分子、原子或离子
B.
自由基主要是由于化合物的离子键发生均裂而产生的
C.
都具有顺磁性、化学性质活泼、反应性高、半衰期短的特点
D.
当体内自由基产生和清除失去平衡就会使机体处于氧化应激,造成机体的损害
【判断题】AT89S51 单片机的外部中断 EX0 可以配置为低电平触发或者是下降沿触发( )
A.
正确
B.
错误
【判断题】AT89C51单片机的外部中断INT0可以配置为低电平触发或者是下降沿触发。
A.
正确
B.
错误
【单选题】设置外部中断0为电平触发方式。下列设置语句正确的是()。A.IT0=0; B.; C.; D.;
A.
IT0=0
B.
IT0=1
C.
IT1=0
D.
IT1=1
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