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【简答题】
Jennie sat at her window as usual, looking out upon the street, with a look of sadness on her face,“What a long day this is going to be!” Then she saw a little boy running down the street, swinging his schoolbag. Looking up to the window, he took off 1 hat and bowed with a bright, pleasant smile. “What a nice 2 ,”said Jennie to herself, as the boy ran out of sight.“It seems like having the sunshine. I wish everybody who goes by would look up 3 smile.” George, the little boy, told his mother about that 4 girl when he got back home,“She looks so helpless. I wish I could do something for her.” “Why not give her some 5 ?”said his mother. George agreed. The next morning, as Jennie 6 at he window again, she saw George with a handful of beautiful flowers carefully picking his way across the street. He stopped in front of her window, smiling pleasantly, and said,“Can I come in?”Jennie told him 7 to get into the house. Opening the door to Jennie’s gentle“Come in”, George said, “I’ve brought you some flowers.” “Are they for me?”said Jennie 8 .“How kind you are,”she continued, as George put the flowers on her lap.“I’ve 9 received any flower since we moved to the town.” “Did you live in the countryside?”asked George, 10 the old, small and empty room. “Yes,”said Jennie. Jennie used to have a happy family and live in a beautiful house in the countryside. However, she lost her right leg in an accident. She 11 walk like other people any longer. Later, her father died, and her mother was sick 12 so many years that their money was all gone. They sold the house, and move here to get work to do. George told his parents 13 . They decided to help her. More and more people in the 14 gave Jennie friendly smiles when they passed by her house. She was greatly cheered up. A few months later, Jennie and her mother 15   a flower shop. People could always see Jennie sitting in the shop, having a lovely smile on her face. 小题1: A.her B.his C.your D.my 小题2: A.house B.door C.smile D.schoolbag 小题3: A.and B.but C.as D.or 小题4: A.rich B.lucky C.bad D.poor 小题5: A.money B.flowers C.clothes D.food 小题6: A.danced B.cried C.sat D.laughed 小题7: A.how B.who C.when D.why 小题8: A.angrily B.easily C.sadly D.happily 小题9: A.never B.usually C.always D.sometimes 小题10: A.looking for B.looking around C.looking like D.looking after 小题11: A.shouldn’t B.needn’t C.couldn’t D.mustn’t 小题12: A.for B.in C.at D.on 小题13: A.something B.anything C.everything D.nothing 小题14: A.countryside B.town C.village D.city 小题15: A.reached B.left C.closed D.opened
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【判断题】对于正弦稳态电路来说,任何一条支路的电压或电流的时域形式与相量域形式可以进行相互转化。
A.
正确
B.
错误
【判断题】对于正弦稳态电路来说,任何一条支路的电压或电流的时域形式与相量形式可以进行相互转化。
A.
正确
B.
错误
【简答题】已知点A(1,2,1),平面π:2x-y+3z-17=0。点A在平面π上投影点坐标是_____,点A关于平面π的对称点坐标是_____。
【判断题】对于正弦稳态电路来说,任何一条支路的电压或电流的时域形式与相量域形式可以进行相互转化。
A.
正确
B.
错误
【单选题】P ( x , y , z ) 关于坐标平面 xOy 的对称点 P 1 , P 1 关于坐标平面 yOz 的对称点为 P 2 , P 2 关于坐标平面 zOx 的对称点 P 3 的坐标为 ( )
A.
( - x ,- y ,- z )
B.
( x , y , z )
C.
(0 , 0 , 0)
【判断题】C-C 、C=C、C≡C三种化学键的键力常数K分别为4.5、9.6、15.6,它们的IR吸收峰的波数σ大小顺序是 (C=C) < (C-C)<(C≡C)。
A.
正确
B.
错误
【简答题】点P(-3,2,-1)关于平面xOy的对称点是(    ),关于平面yOz的对称点是(    ),关于平面zOx的对称点是(    ),关于x轴的对称点是(    ),关于y轴的对称点是(    ),关于z轴的对称点是(    )。
【单选题】波数(σ)是指
A.
每厘米距离内光波的数目
B.
相邻两个波峰或波谷间的距离
C.
每秒内振动的次数
D.
一个电子通过1V电压降时具有的能量
【单选题】波数(σ)是指
A.
每厘米内波的振动次数
B.
相邻两个波峰或波谷间的距离
C.
每秒钟内振动的次数
D.
一个电子通过1 V电压降时具有的能量
【简答题】点A(x,2,3)与点B(-1,y,z)关于坐标平面yOz对称,则x=_____,y=______,z=______.
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