If has been raining        days．

A．these all last few

B．these last few all

C．all these last few

D．these last all few

彩色多普勒技术不可以与下了哪种技术并用

A．二维超声显像

B．频谱多普勒

C．心脏超声造影

D．M型超声心动图

E．以上都不是