问题 判断题

由于离心机滚筒的转速极高,在离心力作用下,密度或体积较大的颗粒被甩向滚筒内壁,使固液两相分离。

答案

参考答案:对

材料分析题

材料一:改革开放之前,农民老王家人多地少,日子过得很紧巴。改革开放以后,头脑灵活、不怕吃苦的老王一家发展起林蛙养殖,凭着自己的辛勤劳动成了远近闻名的富裕户。

材料二:富起来的老王不忘帮助其他农户,经他培训的十几家农户都发展起了自己的林蛙养殖,日子一天比一天好。

(1)材料一体现了教材上的哪些观点?

                                                                                                                                                                

                                                                                                                                                               

                                                                                                                                                               

(2) 材料二反映了老王的什么品质?请简要说明。

                                                                                                                                                               

                                                                                                                                                               

单项选择题