下列变化都属于化学变化的是() A.分离液态空气制氧气食物腐败 B.蜡烛熔化无水 发布时间:2017-05-12 23:47 │ 来源:www.tikuol.com 题型:选择题 问题: 下列变化都属于化学变化的是( )A.分离液态空气制氧气食物腐败B.蜡烛熔化无水硫酸铜加水变成蓝色晶体C.大米酿酒用“84”消毒液消毒D.肥皂水区分硬水和软水洗洁精除油污
题型:选择题 我们已经学习了软体动物、腔肠动物、甲壳动物、昆虫、鱼类、鸟类、哺乳类等动物,这些动物中,体温恒定的有______;用鳃呼吸,用鳍游泳的是______;消化管有口无肛门的是______;属于脊椎动物的有______;属于无脊椎动物有______. 查看答案
题型:选择题 用方框内所给单词的适当形式填空invite; I; dish; meet; teenager1. Laura, could you please do the_ _ __after dinner?2. We often have our class__ __ on Monday afternoon.3. don't like reading this kind of stories.4. It isn't your sweater. It's ______.5. Do you get Linda's for her birthday party? 查看答案
题型:选择题 _____ do you know about table manners in Korea? [ ]A. What B. How many C. How muchD. Which 查看答案