用化学用语回答;
(1)氧元素 ;
(2)高锰酸钾 ;
(3)铝离子 ;
(4)标出氧化铁中铁元素的化合价 。
We all hope you can (接受) our invitation and join us in the picnic.
Some couples are willing to give birth to a second child. The ([ˌpɒpjuˈleɪʃn] may be growing larger.
As we know, Huawei technology has been developing (rapid).
After the earthquake, plenty of food and clothes were provided for the (home)people.
The plan for summer study trip may be (cancel).
Really? I'm looking forward to it.