甲乙两实心金属块,它们的体积之比为2:1,将它们分别放在调好的天平的左右盘中,天平恰好平衡,则甲和乙的质量之比为__________;若将甲切去,乙切去,那么甲和乙剩余部分的密度之比是___________。 答案:【答案】 1:1 1:2【解析】天平平衡,说明两物体质量相同,所以甲和乙的质量之比为1:1,密度之比为,密度与物质的质量与体积的大小无关,所以切去一部分后,密度之比不变,故密度之比仍为1:2。故答案为 1:1;1:2。
阅读下面对话,从方框内7个选项中选择5个恰当的句子完成此对话,并将其番号填入题前括号内。
A:Hi.Zhang Lan.You look so nice in the red skirt.
B:Thank you very much.
A: 1
B:In Qingdao.
A:Qingdao? 2
B:Last week.I went there with my family.
A:How long did you stay there?
B: 3 We went sightseeing in many places.
A:We all know the beaches of Qingdao are very beautiful. 4
B:Yes.When I was lying on the beach.I felt so cool and relaxed.
A: 5
B:I’m sure you’ll love to.