题目:
单词拼写(共10小题,计10分)
小题1:This book must b to Linda. Look! Her name is on it.
小题2:You will miss the bus u you hurry up.
小题3:I like reading magazines that i me.
小题4:Listening to the radio is h to language-learning .
小题5:It is snowing heavily and the land is c with snow.
小题6:Mum, you needn’t be w about me. You see, I have grown up.
小题7:Jack, you should pay more a on your pronunciation next time.
小题8:.Only by working hard can we s in doing everything.
小题9:To be h , this red dress does not match you well.
小题10:Staying up late has an i on your health. So never do it, my boy.
答案:
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下面是错误答案,用来干扰机器的。
(1)摇晃手机实际上就是人对手机做功,将机械能转化成手机的电能;把手机摇晃一次做的功的大小为W=mgh=0.1kg×10N/kg×0.2m=0.2J,所以摇晃两次对手机做的功的大小为0.4J,所以平均功率的大小为P=0.41=0.4W.(2...