物流经营者应根据客户特征，如配送产品特性、地理分布等，合理定位配送区域，同时对不同的配送区域可采取差别性的配送服务政策。
参考答案：对
心脏触及震颤的机制是（）
A.心脏瓣膜轻度关闭不全
B.心脏瓣膜狭窄
C.心房颤动
D.心室颤动
E.左室增大
If they ______ what I was saying, they'd know what I was talking about. [ ]
A. took the trouble to listen to
B. had trouble listening to
C. take the trouble to listen to
D. have trouble listening to
