百公里油耗能用来比较不同排量发动机的燃料经济性。

下列哪项可作为确诊主动脉瓣关闭不全的依据（）

A.苍白面容

B.心尖向左下移位呈抬举样搏动

C.心尖区低调舒张期杂音

D.周围血管征

E.彩色多普勒主动脉瓣心室侧探及舒张期射流

Speaker A: Oh, doesn't your daughter look lovelySpeaker B: ______

A．Oh, no. She looks just so so.

B．Yes, I'm proud of her.

C．Really Why do you think so

D．Well, your daughter looks lovely, too.

As she was singing,she suddenly _____,which  gave us a big surprise  .

A．broke down

B．broke out

C．took down

D．got down

分区画线法适用于杂菌量较多的标本。（）