按要求转换句子。
1. They run so fast. (感叹句)
_______ _______ they run!
2. He is a very tall and thin man. (感叹句)
_______ _______ _______ and thin man he is!
3. Jenny has long hair. (选择疑问句)
_______ Jenny _______ long hair ______ short hair?
4. They sit under the tree every day. (用now改写句子)
They _______ _______ under the tree now.
5. We watch TV in the room. (用she来改写句子)
_______ _______ TV in the room.
6. Look, she's studying English over there. (用sometimes来改写句子)
She _______ _______ English over there.
7. My pen pal comes from Canada. (复数)
_____________________ from Canada.
8. These are their balls under the bed. (单数)
_____________________ under the bed.
1. How fast
2. What a tall
3. Does, have, or
4. are sitting
5. She watches
6. sometimes studies
7. Our pen pals come
8. This is his/her ball
时（T为交流的周期），原线圈中的电流瞬时值为0.03A．变压器的原、副线圈的匝数比为（ ）
：3