如图所示,水平桌面上放置有甲、乙两个完全相同的圆柱形烧杯,分别装入适量的密度不同但质量相等的盐水,将同一个鸡蛋先后放入甲、乙两个烧杯中,鸡蛋在甲烧杯中处于悬浮状态,在乙烧杯中处于漂浮状态.下列判断正确的是( )
A:甲杯中盐水密度为ρ甲,乙杯中盐水密度为ρ乙,则ρ甲>ρ乙
B:鸡蛋在甲、乙两烧杯中受到的浮力分别为F浮和,则F浮>
C:放入鸡蛋后,甲、乙两烧杯对桌面的压力分别为F甲和F乙,则F甲>F乙
D:放入鸡蛋后,甲、乙两烧杯底部受到的压强分别为P甲和P乙,则P甲=P乙
读课文《有趣的作业》句子,回答问题
玻璃纸下,一只胖乎乎的小蜜蜂在轻轻地扇动着翅膀,真有趣!
这句话是把____ 当作____ 来写,从____ 词可看出来。
完形填空。
Tom and his father are 1 in the playground. There is a cat and a dog there. They are playing with a ball together. “I think the cat is 2 than the dog," Tom says, “I don't think so," his father says. “Why?" “Because the dog looks 3 than the cat " Tom laughs and says, "But I like the cat. It is white and it is 4 than the dog. " Tom's father says, “Dogs are my favourite animals because they are very 5 to me " "Yes, but I like smaller ones. Can we keep one?" Tom says. "of course," Tom's father says.
美国“猎户座”飞船于当地时间2014年12月5日07:05分,在佛罗里达州卡纳维拉尔角(28°35′N;80°40′W)发射成功,将承担火星探索重任.火星大气压不足地球大气压的1%,自转轴与公转轨道面的夹角为64°49′.据此回答下题.