— I have too much housework to do at home.
—_______ask your husband for help?
A:You can
B:Why don't
C:Why not
D:How about
石油为原油,没有固定的沸点.加热原油使其汽化,再分别冷却,不同温度下的气体分别得到汽油、柴油、沥青等.据此判断原油为( )
计算x3•x3的结果是( )