房屋外观的整洁、统一由哪些进行维护？
参考答案：
业主、承租人、非业主使用人和物业管理公司共同维护。
She showed the visitors around the museum, the construction had taken more than three years.
A．for which
B．with which
C．of which
D．to which
快速以太网的数据传输速串为______。
A．10Mbps
B．100Mbps
C．1000Mbps
D．10000Mhps
