【单选题】The boy's behaviour was so bad he was branded a ___________ delinquent at the early age of ten.
【单选题】零件的腐蚀按其机理可分为化学腐蚀和( )腐蚀。
【单选题】— ______ weather! It's raining! —Bad luck! We can't go climbing today. [ ]
【单选题】企业目标并不是一成不变的,应根据外部环境的变化及时调整与修正,使其更好地实现企业的宗旨,这就是确定企业目标的( )原则。
【判断题】零件的腐蚀按腐蚀的机理可分为化学腐蚀和电化学腐蚀 。