---Can you tell me _____________?---Of course. Japan.
A:what’s his job
B:where does he come from
C:where he is from
D:what language he speaks
如图所示,质量为m的正方体和质量为M的正方体放在两竖直墙和水平面间,处于静止状态.M与m的接触面与竖直方向的夹角为α,若不计一切摩擦,下列说法正确的是( )
受北半球反气旋控制下的天气是( )
水和干泥土的比热容之比是5:1,质量之比是1:2,吸收的热量之比是3:2,则水和干泥土升高的温度之比是( )