选词填空and, cleaning, drawing, what, talkin_爱下问搜题

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问题填空题

选词填空

and, cleaning, drawing, what, talking,has, playing, washing, they, four

           Here is Jack's family photo, There are    1   people in his family.    2   are Jack's parents, Jack's
little brother  3   Jack. Jack's mother is    4   clothes. His father is   5     the car. His little brother is     6
basketball. And Jack is     7    .Jack   8    a cat.   9    is it doing? Oh, it is playing in the tree. A bird is
   10    with the cat. How happy they are!

答案

1. four 2. They 3. and 4. washing 5. cleaning

6. playing 7. drawing 8. has 9. What 10. talking

判断题

证券公司、资产托管机构、第三方存管机构破产或者清算时，客户委托资产应纳入其破产财产或者清算财产。______

计算题

在以坐标原点O为圆心、半径为 r的圆形区域内，存在磁感应强度大小为 B、方向垂直于纸面向里的匀强磁场，如图所示。一个不计重力的带电粒子从磁场边界与x轴的交点A处以速度v沿－x方向射入磁场，它恰好从磁场边界与y轴的交点C处沿+y方向飞出。

（1）请判断该粒子带何种电荷，并求出其比荷q/m ；

（2）若磁场的方向和所在空间范围不变，而磁感应强度的大小变为，该粒子仍从 A处以相同的速度射入磁场，但飞出磁场时的速度方向相对于入射方向改变了60°角，求磁感应强度多大？此次粒子在磁场中运动所用时间 t是多少？