下列图形符号中表示液压信号管的是（）。
A.
B.
C.
D.
参考答案：D
This is an old photo of my aunt’s when she had ___ , and she now she has ____.
A．short hair; gray hairs
B．short hairs; gray hair
C．short hair; gray hair
D．short hairs; gray hairs
根据《华润置地商业物业服务标准》要求，回访及时率（）。
A.95%
B.100%
C.98%
D.90%
