正常情况下动脉血【HCO3-】/【H2CO3】的比值为()
A.2/1
B.10/1
C.20/1
D.50/1
E.100/1
参考答案:C
—It is said that Mr Wang has won first place in the English contest for teachers.
—________ and ________ one day.
A.So has he; so will you
B.So he has; so you will
C.So he has; so will you
D.So has he; so you will
摆放钻机泥浆槽是由()。
A、司钻
B、二钻
C、一钻、二钻
D、三钻