选词填空。
1. Today ____________ (is, was) Spring Festival.
2. I can show you what ____________ (do, to do).
3. I'm going to ____________ (play, played) football.
4. It's going to ____________ (be, is) the year of the tiger.
5. We are ready ____________ (to, for) the Spring Festival.
6. Everyone ____________ (want, wants) to go outside.
7. I ____________ (not, don't) think I can play the piano.
8. The walls ____________ (is, are) dirty.
9. What ____________ (else, other) do you do?
10. Last year, my mother ____________ (buy, bought) me a skirt.
时刻线圈通过中性面
时刻线圈中磁通量最大
时刻线圈中磁通量变化率最小