容积式流量计的精度最高可达（）级。
A.0.05
B.0.1
C.0.2
D.0.5
参考答案：B
131I治疗甲亢时下列哪一条应考虑增加剂量（）。
A.病程短
B.未经任何治疗
C.结节性甲状腺肿
D.Graves病
E.年龄小
It's very late now. How long have you _____ computer games?[ ]
A. playing
B. be playing
C. played
D. been playing
