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- 1使用分子和原子的观点解释下列问题
- 2气球下挂一重物,以v0=10m/s匀速上升,当到达离地高h=175m处时,悬挂重物的绳子突然断裂,那么重物经多少时间落到地面?落地的速度多大?空气阻力不计,取g=10m/s2.
- 3the_____from shanghai to seattle takes about 20 hours[fly]
- 4用括号中所给单词的适当形式填空.She would like _____(buy) a mobile phone.
- 5a2+b2+c2=ab+bc+ca
- 6am not, aren't, isn't, can't, don't doesn't
- 7Tom is busy doing his homework.
- 8大桶能装5千克油,小桶能装4千克油,你能用这两桶量出6千克有吗?怎么量?
- 9串联、并联电路中电压规律以及再解释一下
- 10甲乙两班共有学生95人,从甲班调8名学生到乙班,再从乙班调35名学生到丙班,这时甲班的人数是乙班的2倍.原来甲、乙两班各有多少人?