Có những chất sau: P, CuO, Ba(NO3)2, H2SO4, NaOH, O2, H2O. Hãy viết PT phản ứng điều chế những chất: H3PO4, Cu(OH)2, HNO3, Na3PO4, Cu(NO3)2

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.

Choose the best answer.

We should decorate our living room with _____ orange banner. We also need ________  ribbons, balloons, party hats and costume.

Choose the best answer.

I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.