Các oxit axit như CO2, SO2, SO3, NO2, P2O5, SiO2,...
Đáp án:
P2O5 ; SO2 ; SO3 ; CO2 ; SiO2 ; ...
Giải thích các bước giải:
Choose the best answer.
I think you should buy _____ pack of mineral water instead. And you can also buy _____ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______ cookies and soft candies.
We should decorate our living room with _____ orange banner. We also need ________ ribbons, balloons, party hats and costume.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.