若方程 是关于x的一元二次方程，则m=____.

Last Sunday the Greens went to climb the hill. When they got home, it was very late. Mr. Green opened the front door and they both went into the house. Because it was too late, Mrs. Green turned on the light. Just they wanted to come into the bedroom, Mrs. Green suddenly said, “ Listen, there is someone in our bedroom.” They stood quietly outside the door. They could hear some voices in the room.
“There are two men in it. They are talking.” So Mr. Green began to shout. “Who is there?” But no one answered. Mr. Green opened the door quickly and turned on the light. There was no one there. Mr. Green found something and laughed. The radio was still on! “I forgot to turn it off this morning.” Mr. Green said.

如图是一款利用电磁悬浮技术制作的没有“地轴”的地球仪，其原理是：将空心金属球放在通电的线圈上，电磁场在金属球表面产生涡流，涡流与磁场作用形成磁力，从而实现地球仪的悬空静止。地球仪悬空静止的原因是（  ）

“匆”字用音序查字法先查音序____，再查音节____。按部首查字法先查____部，再查____画。意思：____。词语：____、____。