下列哪项属于彩色多普勒技术
A．二维灰阶显像
B．多普勒频谱图
C．造影剂增强血流信号
D．伪彩色编码二维显像
E．M型超声(超声心动图)
参考答案：B
.It is reported that two exhibition centres, ____are being built in my city, will
open next year.
A．they both
B．both of which
C．which both
D．both of them
亚临床甲亢的实验室检查特点为（）
A.T3、T4↑，TSH↓
B.T3、T4↓，TSH↑
C.T3、T4正常，TSH正常
D.T3、T4↓，TSH↓
E.T3、T4正常，TSH↓
