【单选题】将4g 溶解在1L水中,取出10mL,其物质的量浓度是
【判断题】碰一下新生儿的手,会引起他的全身运动,这是神经纤维尚未髓鞘化,刺激传导引起的分化现象。()
【简答题】W hat is the woman going to do? A.Make another museum tour. B.Organize an exhibition of art. C.Visit some European painters.
【单选题】将4.000gNaOH溶解在50mL水中,再稀释定容在1L容量瓶中,从中取出100mL,则取出的100mL溶液的物质的量浓度是( )
【简答题】W: I heard you went to the painting exhibition. __1______ it? M: I thought ___2___. I really recommend you go to see it. W: Well... __3___, I seldom go to these art exhibitions. Is it worth seeing? M:...
【判断题】碰一下新生儿的手,会引起他的全身运动,这是神经纤维尚未髓鞘化,刺激传导引起的泛化现象。()
【单选题】t℃时,将50g氯化铵溶解在100g水中刚好达到饱和,在该温度时,从中取出30g氯化铵饱和溶液加入水中稀释至125g,则此时溶液中溶质的质量分数是( )