【多选题】旅游企业的横向一体化所形成的垄断力量较少的原因是( ) The reason of less monopoly power deriving from the lateral integration of tourism enterprises is ( )
A.
不易获得国家相关政策的支持 Not easy to obtain national policy supporting
B.
旅游服务生产是与旅游者活动空间结合的经营活动,服务产品不具有移动性和储存性 The service production of tourism industry is an activity that combines with the space of tourist activity , and the service product has no mobility and no storage.
C.
旅游服务生产是与旅游者活动时间结合的经营活动,产品无法进行时间分配与调整 The service production of tourism industry is an activity that combines with the time of tourist activity, so the product can not be allocated and adjusted.
D.
旅游需求具有高需求弹性 和高替代性特点 Tourism demand is characterized by high demand elasticity and high substitution.
【简答题】下列程序的功能是:给r输入数据后计算半径为r的圆面积s。程序在编译时出错。main(){ int r; float s;scanf("%d",&r);s=pi*r*r;printf("s=%f\n",s);}出错的原因是()。A. 注释语句书写位置错误 B. 存放圆半径的变量r不应该定义为整型 C. 输出语句中格式描述符号非法 D. 计算圆面积的赋值语句中使用了非法变量