A:线圈平面每经过中性面一次,感应电流方向就改变一次.感应电动势方向不变
B:线圈每转动一周,感应电流方向就改变一次
C:线圈平面每经过中性面一次,感应电流和感应电动势方向都要改变一次
D:线圈转动一周,感应电流和感应电动势方向都要改变一次
第一次世界大战是帝国主义战争,这一结论的依据是( )
Our Trip to Yibin City
When
On Friday.
How
We will go there 1.
What
But you will need to bring 2 .
Where
Then in the afternoon we will go to 3.
What time
⑴Now please remember that the bus will leave right at 4 .
⑵Tell your parents we'll be back at school 5.
从同一高度相隔1s先后释放两个相同小球甲和乙,不计空气阻力,它们在落地前( )
下列各句中加横线的词语,古今意义相同的一项是( )