【简答题】(a) What is the capacity for electrons of an s sublevel? A p sublevel? A d sublevel? An f sublevel? (b) What is the total capacity for electrons of the fourth principal level?
【简答题】给问句选择相应的答语。 ( ) 1. Where are you from? ( ) 2. Where are you? ( ) 3. What do you see? A. I see r-o-s-e, rose. B. I'm from China. C. I'm in the house.
【简答题】用am,is,are填空。 1. Where _____________ you from? I _____________ from China. 2. Where _____________ he from? He _____________ from England. 3. What _____________ your mother? She _____________ a teac...