1 khí cầu có vận tốc là 10m^3 chứa hiđro có thể kéo lên trên không 1 vật bằng bao nhiêu? Biết m=10kg . Dkk=1,29km/m^3 ,Dh=0,09kg/m^3 b, : muốn kéo 1 người nặng 60kg bay lên thì khí cầu phải có thể tích bằng bao nhiêu?

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.