关于胎盘早剥的症状和体征，下列哪一项不正确

A、an increase in the price of mp3 players
B、a decrease in the number of sellers of mp3 players
C、an increase in the price of plastic, an input into the production of mp3 players
D、an improvement in the technology used to produce mp3 players

A.让医生及时了解患者的治疗状况、是否有效
B．无特殊意义
C．是否需要调整治疗方案
D．及时停药