— How was your stay in Hong Kong?
—________. And it was a pity that I couldn't stay there longer.
A:Nothing could be worse.
B:It was just fantastic.
C:A terrible experience.
D:What a hard time I had!
①物体的质量是2.8kg;
②物体的体积是1×10﹣3m3;
③物体浸没时受到的浮力是15N;
④从乙到丙,水对烧杯底面的压强减小了250Pa.
2460=____+____+____
4506=____+____+____+____
6003=____+____