题型:问答题 简答题 Look at the tree, there are many birds ___it.There are also some apples it. [ ]A. in, onB. on, in C. in, inD. on, on 查看答案
题型:问答题 简答题 如图是A,B,C三种物质的质量m和体积V的关系图线,由图可知,A,B,C三种物质的密度ρA,ρB,ρC的关系是 ______.由C种物质做成的实心物体M重为1N放进水中,自然状态下,M受到的浮力 ______1N.(填“大于”、“小于”或“等于”) 查看答案