题目内容：
彩色多普勒显像的血流信号的特点是（）The characteristic of the blood signal in color mapped Doppler image is（）
A.红色是静脉血，蓝色是动脉血red - Venous blood flow； blue-Arterial blood flow
B.红色是正常血流，绿色是异常血流red - normal blood flow； blue- abnormal blood flow
C.红色是动脉血，蓝色是静脉血blue - Venous blood flow； red - Arterial blood flow
D.红色是血流朝向探头，蓝色是血流背向探头red - blood flow toward the transducer; blue - blood flow away from the tranducer
E.红色是血流背向探头，蓝色是血流朝向探头red - blood flow away from the transducer; blue - blood flowtoward the tranducer
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