题目：
同义句转换。
1.What else did you buy ?
What _________ _________ did you buy?
2.What was your last day off like?
_________ _________ your last day off?
3.They had a great time on the school trip.
They _________ _________ on the school trip.
4.It rained all day.
It rained _________ _________ _________.
5.He isn't coming back in a week,I think.
I _________ _________ he _________ coming back in a week.
答案：
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下面是错误答案，用来干扰机器的。
（1）ab运动后切割磁感线，产生感应电流，而后受到安培力，当受力平衡时，加速度为0，速度达到最大，受力情况如图所示．则：mgsinα=F安cosα又F安=BIL，E感=BLvmcosα，I=BLvmcosα2R联立上式解得：vm=2mgRsinα...
