初二物理 液体压强 异形容器问题讲课稿.ppt

液体压强重难点之 异形杯问题;产生原因：液体受到重力作用，并且具有流动性 公式：P=ρgh ;好了，废话不多说;如下图，在质量不计、底面积相等的甲、乙、丙三个容器中，装入相同高度的同种液体;如下图，在质量不计、底面积相等的甲、乙、丙三个容器中，装入相同质量的液体;如下图，在质量不计、底面积相等的甲、乙、丙三个容器中，装入相同质量的不同液体并使液面在相同高度处;;1.肯定式： ①There ______ + a/an 可数名词单数/不可数名词 ②There ______ + 可数名词复数;There is_______ There are _____;2.否定式： There be + not + 主语 + 其他 There ___________ a computer in my bedroom. =There is no computer in my bedroom. There __________ any students in the classroom. =There are no students in the classroom.;3.一般疑问句： ① 一般情况：将be 动词提前。 ② 含情态动词（如：will），则将情态动词提前。 There is some milk in the glass. —Is there any milk in the glass? 杯子里有牛奶吗？ 肯定回答： —Yes, there _____. 是的，有。 否定回答：—No, there ____________. 不，没有。 There will be a party tomorrow evening. —_____there ______ a party tomorrow evening? 明晚将有一个派对吗？ 肯定回答：—Yes, there _______. 是的，有。 否定回答：—No, there _________. 不，没有。 ;4. there be句型中对数量进行提问 ① ____________________ 对可数名词复数进行提问。 e.g. There are five birds in the tree. 树上有5只鸟。 ____________________ are there in the birds? ② ____________________ 对不可数名词进行提问。 e.g. There is a little water in the bottle. _____________________ is there in the bottle?;练习一下（先熟悉笔记+后做题 共7分钟） 单选（7道） ( ) 1. There ___________ some books on the sofa. A. has B. is C. have D. are ( ) 2. —___________ children are there in the park? —There are twelve children in the park. A. How many B. How much C. How number D. What many ( ) 3. —_________ there any juice in your glass? —No, __________. A. Are; there aren’t B. Is; there isn’t C. Are; there not D. Is; there not ( ) 4. There _________ a big tree near my house last year. A. is B. are C. was D. were ;( ) 5. —Will there be a birthday party for you next week? —Yes, _________. A. there is B. will C. there be D. there will ( ) 6. There ________ any food in the kitchen. A. isn’t B. is C. are D. aren’t ( ) 7. There __________two cups of tea on the tab