【简答题】如果3a=4b,a、b都不为零,那么a:b=3:4.______.
【简答题】How can we explain the popularity of neckties? For years, fashion historians have predicted that men would 45 wearing ties because they seemed to have little or no function. It may be that men to them...
【简答题】如果3a=4b,那么a:b=______:______;如果 5 b =a(b≠0) ,a和b成______比例.
【单选题】黄某,男性,32岁头部被铁棍击伤,头皮裂开已12h 以上,伤口无明显感染,其处理为( )