调整合同价格属于( )。
A．工期索赔B．延期索赔C．费用索赔D．变更索赔
参考答案：C
There are_____ books on the desk, but there aren't _____ rulers.[ ]
A. any, some
B. some, much
C. some, any
待客礼仪怎样规范了礼貌送客？
