①将微小压强计的探头放入A烧杯的水中,探头到烧杯底的距离为L,如图甲所示,记录微小压强记U形管两侧的液面高度差h1;
②保持探头到烧杯底的距离L不变,向A烧杯内再缓慢加入适量的水,如图乙所示,记录微小压强记U形管两侧的液面高度差h2;
小金发现h2>h1,于是得出结论“液体产生压强与液体所受的重力有关”,请你指出小金实验中的不足之处是:____;写出改进的方法:____.
I' m Jiang Ling from Hangzhou and I' m in Class 2. There are forty-five students in my class — twenty boys and twenty—five girls. I have got two good friends. One is Hu Ning. He is on my left. He is good at maths. The other is Tu Guo. He is on my right. IT is his favourite. After school, we usually read in the library or work on the computer. Now we are having a history lesson.
I'm Paul from London and I'm in Class 4. There are twenty-two students in class — twelve girls and ten: boys. Tim is my good friend. He is behind me. He is tall and he is good at PE. We usually play basketball on Friday afternoon. Now it's cool. We're playing basketball in the playground.
如图,在▱ABCD中,边BC的垂直平分线EF分别交AD、BC于点M、E,交BA的延长线于点F.若点A是BF的中点,AB=5,▱ABCD的周长为34,则FM的长为( )