ACN值一般是：（）.
A.固定的数值
B.随温度变化
C.由机场建设部门提供
D.在不同道面和不同土基上ACN值不一样
参考答案：D
.
If this computer does not give complete satisfaction, please return it to the maker stating when and where it was ________.
A．designed
B．operated
C．purchased
D．made
资源
