单项选择题 Which of the following does not belong to the group of three fundamental questions mentally asked by the audience? A、Says who? B、So what? C、What do you mean? D、Why should I believe you?

单项选择题 某二元物系，原料液浓度xF=0.35，连续精馏分离得塔顶产品浓度xD=0.92。已知塔顶产品中易挥发组分回收率η=0.9，则采出率为哪个？ A、0.123 B、0.786 C、0.342 D、0.321

单项选择题 下列设备哪些不是嵌入式设备 A、移动设备 B、笔记本 C、汽车电子 D、数字电视