主动脉瓣中度狭窄时瓣口面积为( )。
A.<0.75cm2
B.0.75~1.0cm2
C.1.1~1.75cm2
D.1.76~2.0cm2
E.2.1~4.0cm2
参考答案:B
18. He worked day and night, and finally his dream ________ a teacher ________.
A.of becoming; was come true
B.of becoming; came true
C.to become; came true
D.to become; was come true
大曲中有哪些微生物?