质量相同的木块和冰块分别放在盐水和水中，均浮在液面上，木块受到的浮力______（填“大于”、“等于”或“小于”，下同）冰块受到的浮力，木块排开盐水的体积______冰块排开水的体积．
木块、冰块均漂浮，所以所受的浮力相等，都等于自身的重力；
因为排开的液体的重力相等，也就是说排开的液体的质量相等，盐水的密度大于水的密度，根据公式V=
可知，木块排开盐水的体积小于冰块排开水的体积．m ρ
故答案为：等于；小于．
阅读短文，用方框内所给单词的正确形式填空，使短文意思通顺、完整。注意：①每个词只能用一次。②每空限填一词，有一些词需要做相应的变化。③其中有两个多余选项。
We all enjoy getting close to friends. 小题2:__________ we are happy, we would like friends to have a talk and share（分享） the good news. When we are 小题3:_______, we need our friends to share our bad news. It’s nice to have friends to talk, to laugh, to cry and to share. If we don’t have any friends, we’ll feel very lonely(孤独). Sometimes our friend may be 小题4:_________ from us, we’ll feel sad and miss them. We can keep friendship by writing letters or E-mails, making phone calls or in many other小题5:_______. We are often making 小题6:__________ new friends in our life. But we shouldn’t forget old friends when we have new friends. The more friends we have, the 小题7:________ we’ll be. We should look after our friendship a lot. 小题8:________ more about our friends and don’t see them by their looks. Believe in your friends. And 小题9:_______ leave them when they are in trouble. Keep your words and you’ll have real friends in life. There’s more good news from people who have many friends. They also live longer. So good friendship also helps you stay in good小题10:________. |