【单选题】将4g 溶解在1L水中,取出10mL,其物质的量浓度是
【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:...
【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( )
【多选题】以下关于冷却液大循环的描述中,正确的有( )
A.
发动机冷却液温度高于75℃时,散热器将直接通往水泵的小循环通道关闭;
B.
从缸盖水套流出的冷却液全部进入散热器进行散热;
C.
散热后的冷却液由水泵送到缸体水套外部进行循环;
D.
由于经过散热器散热,可迅速下降发动机冷却液温度;