电磁感应定律：回路中感应电动势的（）和磁通变化的（）成正比。

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问题填空题

答案

参考答案：大小；速率

选择题

选择与对话相符的图片。
( ) 1. —What time is it? —It's three o'clock. ( ) 2. —What's the date? —It's June first. ( ) 3. —What's this? —It's a chair. ( ) 4. —How's the weather today? —It's rainy. ( ) 5. —How many books do you have? —Five.

判断题

接种疫苗可以预防艾滋病。