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【】 一平面试验线圈的磁矩大小 p m 为 1×10 -8 A·m 2 ,把它放入待测磁场中的 A 处,试验线圈如此之小,以致可以认为它所占据的空间内场是均匀的。当此线圈的 p m 与 z 轴平行时,所受磁力矩大小为 M =5×10 -9 N·m ,方向沿 x 轴负方向;当此线圈的 p m 与 y 轴平行时,所受磁力矩为零。则空间 A 点处的磁感强度 的大小为 ____________T , ______(填x、y或z)轴 (填正或负)向 。(结果保留一位小数)
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【单选题】听力原文：M: Mary，who's the guy you were with at the movie theatre last night? W: Oh，he's Mark. He's my English teacher. He's learning Chinese from me and the film was my lesson for him. Q: What do we lear...
A.
Mary's English teacher is Mark．
B.
Mary's Chinese teacher is Mark．
C.
Mary and Mark are good friends．
D.
Mary and Mark are office colleagues．
【简答题】In the last 500 years, nothing about people — not their clothes, ideas, or languages — has changed as much as what they eat. The original chocolate drink was made from the seeds of the cocoa tree by S...
【简答题】假设某专业有若干个班,每个班有若干学生,每个学生包含姓名和分数,这样构成一棵树,如图 1 所示。假设树中每个结点的 name 域均不相同,该树采用孩子兄弟链存储结构,其结点类型定义如下: typedef struct node { char name[50]; // 专业、班号或姓名 float score; // 分数 struct node *child; // 指向最左边的孩子结点 stru...
【单选题】听力原文：W：Were you caught in the rain last night? M：No，I was already safe inside the house． Q：What happened last night? (18)
A.
It rained for a short while.
B.
There was a' car accident.
C.
There was a fire.
D.
It snowed heavily.
【单选题】听力原文：M: What were you doing last night? W: I was going to watch television but my uncle rang and invited himself to dinner! So, I have no other choice. What did the woman do last night?
A.
Watched television.
B.
Had dinner outside with her uncle.
C.
Cooked for her uncle.
D.
Visited her uncle's house.
【单选题】听力原文：M: What were you doing at twelve last night? W: I was playing cards with my kids in the kitchen. M: Do your kids always go to bed that late? W: Not on weekdays. M: Wasn't your husband with you th...
A.
A teacher.
B.
A policeman.
C.
A postman.
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