【单选题】Too much _____________ to dirty air can cause people to suffer from allergies and diseases that will eventually affect people’s hea lth .
【单选题】Stop ______ so much noise! My father is sleeping. [ ]
【判断题】用相同浓度的HCl溶液滴定氨水溶液,终点时可选择甲基橙作指示剂。
【判断题】开启香槟酒时,其瓶口始终不能朝向顾客或天花板,以防酒液喷到顾客身上或天花板上。
【判断题】用HCl滴定氨水时,指示剂可选用甲基橙,也可选用酚酞。
【多选题】测定蛋白质浓度的方法主要有 [填空(1)] 、 [填空(2)] 、 [填空(3)] 和 [填空(4)] 。
【单选题】— Do you think the MP3 player put its listener ________? — Yes, too much use of it could lead to hearing loss, experts say.