主动脉瓣轻度狭窄指瓣口面积()
A.1~1.5cm2
B.1.5~2.5cm2
C.4~8cm2
D.2.5~3.5cm2
E.2~3cm2
参考答案:A
As is often the _______, the housewife gives the house a thorough cleaning ________. [ ]
A. matter; every two days
B. situation; each second day
C. same; each two days
D. case; every second day
细菌L型()。
A.CO2气体环境
B.厌氧环境
C.碱性环境
D.高渗增菌液增菌
E.生长因子