标出图中通电螺线管和小磁针的南北极（用“S”和“N”表示）._爱下问搜题

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问题应用设计题

标出图中通电螺线管和小磁针的南北极（用“S”和“N”表示）.

答案

根据右手螺旋定则判断。

选择题

下列命题中的真命题是

A.一组对边平行，另一组对边相等的四边形是平行四边形
B.有一组对边和一组对角分别相等的四边形是平行四边形
C.两组对角分别相等的四边形是平行四边形
D.两条对角线互相垂直且相等的四边形是正方形

完形填空

"Everything happens for the best, "my mother said whenever I faced disappointment, "If you   21   on, something good will happen some day."
Mother was right, as I discovered after graduating from college. I had   22  myself for a sports announcer. So I went to Chicago to knock on the door of every station and was 23  every time. In one station, a kind lady told me that 24 stations wouldn't employ a person without   25   since I had just graduated. "Go out in the town and find a small station that might give you a chance, "she said.
I returned to Dixon, where I had finished my high school education and had   26  in the school football team. My father said that our town had built a store and wanted a man to manage its sports department. The job sounded just 27 for me but I wasn't hired.
My disappointment had 28 as if by design. "Everything happens for the best," Mum  29 me. Dad lent me his car to look for a job. I tried WOC Radio Davenport. The program director told me they had already hired an announcer.   30 I left his office, I asked aloud," 31 can a fellow get to be a sports announcer if he can't get a job in a radio station?" Suddenly, I heard the director 32 . "Do you know anything about football? " Then he asked me to 33  an imaginary game. It was easy, and I did it without difficulty. The director was 34 and told me I would be broadcasting a game on the   35    Saturday.

B．examination

B．disappeared

C．broadcasting