题目

桌面上的烧杯盛有半杯浓牛奶，如果再向烧杯内加水，则烧杯对桌面的压强将________。加水前后，深度都为h的某处受到的液体压强将________。（选填“变小”、“变大”或“不变”） 答案：【答案】变大 变小 【解析】如果再向烧杯内加水，烧杯内水的重力变大，杯和液体的总重变大，对桌面的压力变大，而受力面积不变，根据知，压强变大；加水后牛奶的密度变小，根据p=ρgh知，深度都为h的某处受到的液体压强变小。根据中文和首字母填空（共18题20空，每空0.5分，共10分）小题1:____________ (游泳) for sometime after a tiring day is very enjoyable and exciting for me in summer.小题2:Almost no high school students are  __________（满意）with the school hours in china.小题3:On  ___________ （平均）, he works seven hours a day.小题4:This gold watch was passed down from one ________________（一代）to another.小题5:The news that was _________________（广播）on the radio surprised us all.小题6:It is impossible for him to be ________（专心于）to his studies as he is __________(狂热)about computer games小题7:Our students are busy _________________（准备）for the final exams.小题8:I know from my own  _____________（经历）how difficult this kind of work can be.小题9:The book tells us m____________ about English culture.小题10:After g_________________ from university, he once worked as a newspaper reporter.小题11:It’s the first time the painting has been displayed in the e____________ room小题12:She is gaining weight because she likes eating d   ______too much.小题13:The policeman told me to go s____________ on and turn left at the second crossing.小题14:I can tell them we had an e___________, and then they won’t be angry any more.小题15:The money for dog food is gone, but Spot looks like he is s________.小题16:Much to my surprise, the young girl takes c________ of a big company.小题17:The best way to earn r__________ at school is to work hard and a________ high grades.小题18:You are s_________ to hand in your homework next Tuesday morning.