雷达回波功率与下列哪些因子成正比（） ["脉冲宽度","脉冲长度","雷达波长","脉冲重复频率"]
双代号网络计划中，关于节点的表述错误的是（）。 ["网络图节点的编号顺序应从小到大，可不连续，但不允许重复","终点节点只有内向箭线","一项工作应当只有唯一的一条箭线和相应的一对节点，且要求箭尾节点的编号大于其箭头节点的编号","中间节点既有内向箭线又有外向箭线"]
简述传闻证据的概念与特征。
生物膜反应器
Which two demonstrate encapsulation of data？（） [" Member data have no access modifiers."," Member data can be modified directly."," The access modifier for methods is protected."," The access modifier to member data is private."," Methods provide for access and modification of data."]
NURBS
