正常人血浆中NaHC03/H2C03之比是
A.5:1B.10:1C.15:1D.20:1E.25:1
参考答案:D
解析:比例为20:1,pH为7.4。
---When did the terrible earthquake in Japan happen?
----It happened _________the afternoon of March 11, 2011.
A.at
B.in
C. on
D. since
遥控台主/备DTR100是由()负责管理主、备机转换功能。
A.IMC卡
B.IMC卡、ALB-S卡共同
C.IMC卡、BB组件共同
D.IMC卡、TX组件和RX组件共同