【简答题】请根据句意从方框中选择适当的词, 并用其适当的形式填空。 be, spell, have, her, look 1. ________ is my sister, Angela. 2. How do you ________ grandma? 3. ________! This is my mother. 4. I don't ________ a son named Bob. 5. These...
【简答题】根据语境或句意,从所给词的适当形式填空。 1. 'I'd like to help _______ with their schoolwork. ' 'You could volunteer in an after-school study program.' (kid) 2. Teresa likes crispy cookies. They are hard, dry and _______ ...
【判断题】溶胶是高度分散的多相系统,具有较高的表面能,是热力学不稳定系统。( )
【单选题】periodic digital signal
【简答题】periodic inventory system