QoS的业务级别必须按照（）等参数进行定义。
A.带宽
B.延迟
C.错误率
D.优先级
参考答案：A, B, C, D
Would you please tell me _____? [ ]
A. where the East Airport is
B. how far the East Airport was
C. how can we get to the East Airport
D. when was the East Airport built
西方软管理的实施方式（）
A.软性组织
B.参与管理
C.激励艺术
D.企业文化
