—They ______ really hard. There is no success without effort.
A:studied
B:enjoyed
C:compared
D:practiced
香港、澳门地处南海之滨,所属的气候类型是( )
设长方体砖块的三条棱长之比为1∶2∶4,如果将两块相同砖A、B按图方式置于水平地面上,则砖块A对砖块B的压强与它们对地面的压强之比pA∶pB=____;砖块A对砖块B的压力与B对地面的压力之比FA∶FB=____.