对已经注册的商标有争议的，向商标评审委员会申请裁定的期限是自申请人提出商标注册申请之日起3个月内。
参考答案：错
根据句意,用方框中所给的词的适当形式填空。
1. She spends lots of time _____housework.
2. Li Lei _____swim in the river last year. Look, he is swimming.
3. His mother is ill at home. He _____look after her very day.
4. Tom's life became difficult after his.father's _____.
5. He_____school last year. He wasn't a student any more.
生活中有很多化学问题。下列判断正确的是( )
A．可乐饮料中含有的兴奋性物质咖啡因(C8H10O2N4)属于有机物
B．医疗上，碳酸氢钠是治疗胃穿孔的一种药剂
C．煤经气化和液化两个物理变化过程，可变为清洁能源
D．日常食用的冰糖、麦芽糖都属于单糖
