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- 1小华双休日想帮妈妈做下面的事情:用洗衣机洗衣服要用20分钟;扫地要用6分钟;擦家具要用10分钟;洗完衣服后晾衣服要用5分钟.她经过合理安排,做完这些事至少要花( ) A.25 分钟 B.26
- 2水果店有梨和苹果共160箱,梨卖出20箱,又运进苹果40箱,这时苹果的箱数是梨的2倍.水果店原来有苹果和梨各多少箱?
- 3糖水和盐水的凝固点和纯水的一样吗?为什么?设计个实验验证
- 4溶液 试题 现有0.1mol/L的是NaNO3溶液300mL,0.1mol/L的MgSO4溶液200mL和0.1mol/L的Al2(SO4)3溶液100mL,这3种溶液中硫酸根离子浓度之比是?
- 5We live in a big house with a big pool_________you can go swimming.
- 6已知圆C与圆x²+y²-2x=0相外切,并且与直线x+根号3y=0相切于点A(3,-根号3),求圆C的方程
- 7He was __________ to tell the truth even to his closest friend.
- 8Like most people,I was brought up to look upon life as a process of getting.It was not until in m
- 9小明用 10 元钱正好买了 20 分和 50 分的邮票共 35 张,求这两种邮票各买了多少张?
- 10某工厂生产一批零件,原计划10天完成,由于采用了新的操作方法,提前3天完成了任务.已知原计划每天生产的