问题
单项选择题
试件中剩余磁场强度的大小取决于（）。
A.试件长度与直径之比
B.施加的磁场强度
C.右手定则
D.左手定则
答案
参考答案：B
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试件中剩余磁场强度的大小取决于（）。
A.试件长度与直径之比
B.施加的磁场强度
C.右手定则
D.左手定则
参考答案：B
| 补全对话：根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 | |
| A: Where have you been, Fang Li? I called you, but you weren't in your office. B: 1_ A: What did you do there? B: I found out that the factory was pouring waste water into the river near it._ 2 . Lots of fish have died. A: 3 _ . B: Do you think "Greener China" can do something? A:_ 4_ . We can write a story about it to the TV station and the newspaper. B: 5_ . Businessmen are afraid of newspapers and TV stations. | |
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