(1) in which (2) on which (3) at which (4)by which (5) with which (6)about which 分别(1) in which (2) on which (3) at which (4)by which (5) with which (6)about which (7)from whom 怎样使用 急

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(1) in which (2) on which (3) at which (4)by which (5) with which (6)about which 分别(1) in which (2) on which (3) at which (4)by which (5) with which (6)about which (7)from whom 怎样使用 急
(1) in which (2) on which (3) at which (4)by which (5) with which (6)about which 分别
(1) in which (2) on which (3) at which (4)by which (5) with which (6)about which
(7)from whom 怎样使用 急

(1) in which (2) on which (3) at which (4)by which (5) with which (6)about which 分别(1) in which (2) on which (3) at which (4)by which (5) with which (6)about which (7)from whom 怎样使用 急
你看他们都是定语从句先行词吧,所以which前面的介词其实都是后面从句的介词提前的.
你先把从句中缺什么成分找出来,把which所代表的主句中的词带到从句中的缺空处,你就可以根据语义理解需要什么介词使从句完整,你根本不需要知道他们跟which放在一起是什么意思.比如by:可以表示时间,方式,被动什么的

视which后的句子里的不及物动词而定

这些都要看后面的从句中的短语或者是一些固定的该用什么介词而定。
其实并不难,不要想得太复杂了。都要看句子来分析。

in有里面的意思,on是在表面。which都是定语从句的引导词