The passage suggests that learning to speak and learning to ride a bicycle are _____.
The passage suggests that learning to speak and learning to ride a bicycle are _____.
根据现行国家标准《建筑灭火器配置设计规范》(GB50140),下列配置灭火器的场所中,危险等级属于中危险级的是( )。
根据《标准化法》关于团体标准的说法,正确的是()。