【简答题】阅读理解。 Mr. Black, Ann's father works in a hospital. He's friendly to the patients. So he's very busy all the time. Ann is seven and began to be at school. She often watches TV at home. Some of her frie...
【简答题】本题附图所示的开口容器内盛有油和水。油层高度 h 1 =0.7m 、密度 ρ 1 =800kg/m 3 ,水层高度 h 2 =0.6m 、密度 ρ 2 =1000kg/m 3 。 ( 1 )判断下列两关系是否成立,即 p A =p' A p B =p' B ( 2 )计算水在玻璃管内的高度 h 。 2、