一光滑圆弧形的槽,槽底放在水平地面上,槽的两侧与坡度及粗细程度相同的两个斜坡aa’、bb’相切,相切处a、b位于同一水平面内,槽与斜坡在竖直平面内的截面如图所示.一小物块从斜坡aa’上距水平面ab的高度为2h处由静止沿斜坡滑下,并自a处进入槽内,到达b后沿斜坡bb’向上滑行,不考虑空气阻力,到达的最高处距水平面ab 的高度为h;接着小物块沿斜坡bb’滑下并从b处进入槽内反向运动,沿斜坡aa’向上滑行到达的最高处距水平面ab 的高度为 ( )
A:h2
B:大于 h2
C:小于h2
D:无法计算
(1)Swallows fly back to the ____ part of the country in winter every year.(南方)(2)The space sleeping bag is fixed to the walls to prevent ____ .(飘浮)(3)I am not sure whether the watches are those ____ .(绅士)(4)You will get much____ if you give up eating fast food.(苗条)(5)It is said that this kind of the car is____ designed for her.(特别的)(6)In winter you’d better keep____ warm enough to stay healthy.(you)(7)We____ could not believe our ears when we heard the surprising news.(simple)(8)The water in the river is ____ . You can drink it without cooking.(harm)(9)Works of MoYan is very popular among Chinese____ .(read)(10)My daughter hopes to go abroad for ____ (far) study next year.
仿照句子,在横线上续写一句话。一粒种子,可以无声无息地在泥土里腐烂掉,也可以长成参天大树.一株花朵, , 。
①小微企业与国有大型企业是地位不同的市场主体
②小微企业可以提供就业机会,促进我国经济发展
③扶持小微企业发展有利于增强公有制的主体地位
④扶持小微企业能调动人们的生产积极性和创造性