问题
句型转换
句型转换。
1. I had a few accidents last week.(改为同义句)
A few accidents _____ _____ me last week.
2. He felt tired yesterday.(改为一般疑问句)
_____ he _____ tired yesterday?
3. He is too short to reach the doorbell. (改为同义句)
He _____ to reach the doorbell.
4. His words injured me. (改为被动语态)
I _____ _____ by his words.
5. Look out! That car nearly hit you.(改为同义句)
_____ _____! That car nearly hit you.
答案
l. happened to
2. Did, feel
3. isn't tall enough
4. was injured
5. Be careful
=37°，两导轨之间距离为L=0．2m，导轨上端m、n之间通过导线连接，有理想边界的匀强磁场垂直于导轨平面向上，虚线ef为磁场边界，磁感应强度为B=2．0T。一质量为m=0.05kg的光滑金属棒ab从距离磁场边界0．75m处由静止释放，金属棒两轨道间的电阻r=0．4
其余部分的电阻忽略不计，ab、ef均垂直导轨。（g=10m／s2，sin37°=0．6，cos37°=0．8），求：