改成倒装句
1.It was at no time been more difficult for us to pass the exam. 2.There was a sudden gust of wind and his hat went away.
第一句话好像有语法问题。应该是： It has at no time been more difficult for us to pass the exam. At no time has it benn more difficult to pass the exam. There was a sudden gust of wind and away went his hat.
答：故事发生在很久以前。一位男人惩罚他三岁大的女儿，因为小女孩浪费了一卷金色包装纸。他们的生活并不宽裕。当小女孩想要用包装纸来装饰一个盒子并把盒子放在圣诞树下时，男...详情>>
问：高压输电线，电线耗损的功率能不能用Q=U^2*t/R来表示？为什么?
答：可以用R=U~2/R进行计算,只有过U表示的是输电导线两端的电压,而不是变压器的输出电压,由于学生常将输入电压、输出电压、升压变压器的电压、降压变压器的电压混在...详情>>
