```erlang 1. supervisor:start_child(admin_sup,                                   [{admin, {admin, start_link, [self()]},perm anent , 2000 ,worker, [admin]}]). -> {ok, Child :: child()} |{ok, Child :: child(), Info :: term()}|{error, startchild_err()}    start_child(SupRef, ChildSpec) -> startchild_ret().        SupRef = sup_ref() ChildSpec = child_spec() | (List :: [term()]) child_spec() =     {Id :: child_id(),      StartFunc :: mfargs(),      Restart :: restart(),      Shutdown :: shutdown(),      Type :: worker(),      Modules :: modules()} startchild_ret() = {ok, Child :: child()}                  | {ok, Child :: child(), Info :: term()}                  | {error, startchild_err()} startchild_err() = already_present                  | {already_started, Child :: child()}                  | term(). 2.terminate_child(SupRef, Id) -> Result 3.delete_child(SupRef, Id) -> Result 4.restart_child(SupRef, Id) -> Result 5.which_children(SupRef) -> [{Id, Child, Type, Modules}] 6.count_children(SupRef) -> PropListOfCounts 7.check_childspecs(ChildSpecs) -> Result 该模块只能针对注册过的进程进行修改，比如使用start_child函数无法批量增加进程 ```