单词：vacuum degree of centrifugal chamber
离心腔真空度
单词：vacuum degree of centrifugal chamber 相关文章
She inspected the carpet for small items. She saw a paper clip and a rubber band. She picked them up. She put them into a little box on the kitchen counter. She plugged in the vacuum cleaner. She turned on the switch. The cat ran out of the room. She
发表于:2018-12-07 / 阅读(55) / 评论(0)
原版英语小短文
原版英语小短文
Oliver went to Target to buy a new vacuum cleaner. The vacuum cleaners at Target cost $60 to $500. The expensive ones were too bulky and, of course, too expensive. He bought the cheapest one in the store: a Dirt Devil Vibe. Its label claimed that it
发表于:2018-12-11 / 阅读(57) / 评论(0)
365个英语简短小故事
365个英语简短小故事
This is Scientific American 60-Second Science. I'm Cynthia Graber. This will just take a minute. The fridge is one of your home's biggest energy hogs. Better insulation can make refrigerators much more efficient. And a panel encasing a vacuum is one
发表于:2018-12-24 / 阅读(64) / 评论(0)
Scientific American(五)月
Scientific American(五)月