双代号网络计划的逻辑关系包括( )。
A．时间关系B．搭接关系C．组织关系D．平行关系
参考答案：A
一两岁患儿斜颈视物，如何用最简便的方法鉴别眼性斜颈与先天性斜颈( )
A．同视机检查
B．屈光检查
C．遮盖单眼
D．骨科检查
E．视力检查
Which of the following types of unemployment is most likely caused by long-run changes that eliminate some jobs while generating others for which unemployed workers are not qualified（）
A. Frictional.
B. Structural.
C. Cyclical.
