餐饮服务只能当次享用，这是餐饮服务的（）。
A.一次性特点
B.无形性特点
C.同步性特点
D.差异性特点
参考答案：A
频谱扫描功能可用来评估反向是否存在干扰，该功能在网管的（）管理模块中。
A.动态管理
B.诊断测试
C.配置管理
D.统一数据跟踪
A company that capitalizes costs instead of expensing costs would have :（）
A. higher income variability and higher cash flows from operations.
B. lower cash flows from investing and lower income variability.
C. lower cash flows from operations and higher profitability in early years.
