A:中国沦为了世界市场的附庸
B:清政府的重农抑商政策
C:中国小农经济逐渐走向瓦解
D:民族资本主义的初步发展
—Who can help me carry the heavy box?
—I think David is _______ to do it. But the door is ______for him to go through.
已知f(x)=log2x,x∈18,4,则函数y=f(x22)×f(2x)的值域是____