能准确反映代谢性酸碱平衡的指标是（）。
A.PaCO2
B.PaO2
C.SB
D.动脉血pH值
E.AB
参考答案：C
根据首字母提示及句意，补全单词。
1. This is east, east points r ________.
2. I know they s ________ English and French in Canada.
3. Niagara Falls is a f ________ waterfall in Canada.
4. Beijing is the capital city of C ________.
5. — What c ________ is it?
— It's red.
下咽癌根治性放疗的剂量应在（）
A.40Gy
B.50Gy
C.65～70Gy
D.＞80Gy
E.＞90Gy
