【判断题】在只含有一对正负离子的电解质溶液中,正离子的迁移数只与该种离子的迁移速率有关。
【简答题】java中的基本数据类型有哪些?他们对应的包装类是什么?
【单选题】离子的迁移数是指正负两种离子在作电迁移运动时各自的导电份额或导电的百分数,因此离子的运动速度直接影响离子的迁移数。下面说法正确的是( )。
A.
无论什么离子,它们的运动速度越大,迁移数也越大
B.
同一种离子的运动速度是一定的,故它在不同的电解质溶液中,迁移数相同
C.
在同一电解质的溶液中价数相同的离子,其运动速度越大,迁移数就越大
【单选题】电解质溶液中正离子的迁移数与负离子的迁移数( ) ( )。
【单选题】电解质溶液中正离子与负离子的迁移数之和 ( )
【单选题】–Would you like to go to see the film with us? --Sorry, I can’t. Because I ________ it twice.
【单选题】在同一电解质溶液中,正离子的迁移数与负离子的迁移数之和是( )。
【简答题】听力-J=Jane (Waitress ) S=Stephen Nobel (Guest) J: May I take your order, sir? S: Yes, please. I would like to 1 with a chef’s salad . J: The chef’s salad for 2 . And what would you like to ha...
【单选题】Going back to work after having a nice meal is always difficult. There was a lot of intense work waiting for me. I had to prepare the information for the meeting at 4:00 p.m. After I finished the work...