A:doctors came to their rescue
B:the tall building collapsed
C:an emergency measure was take
D:warnings were given to tourist
在反比例函数 y=k-1x的图象的每一条曲线上,y都随x的增大而减小,则k的取值范围是( )
人体是一个统一整体,各器官、系统之间存在着密切的联系.下图是人体的某些生理活动示意图,请据右图回答下列问题: