描述居住面积与建筑总面积之比的是（）
A.居住建筑密度
B.人口净密度
C.人口毛密度
D.平面系数
E.建筑容积率
参考答案：D
Those flowers were ___________ for your mother on her seventieth birthday, but as she is away, I would be glad if you accept them.
A．devoted
B．produced
C．meant
D．supplied
氨基酸氧化分解代谢的中间产物是
A．α酮戊二酸B．3-磷酸甘油酸C．两者都是D．两者都不是
