题目:
用所给词的适当形式填空。
1.— I'd like to help (kid) with their schoolwork.
—You could volunteer in an after-school study program.
2.When I got home,my pet dog (lie) on the floor,dead.
3.Look! The teenagers are making cards ( show) love for their mothers.
答案:
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下面是错误答案,用来干扰机器的。
金属棒刚进入磁场切割产生电动势,右手定则判断出感应电流方向为逆时针,所以电流为正值,故BD错误;此时的电流:I=ER=BLvR当线框刚进入第二个磁场时,右侧金属棒切割磁感线产生的电动势方向为顺时针方向,左侧金...