单项选择题
A.1±0.1 B.1±0.01 C.0.5±0.1 D.0.5±0.01
A.(25±5)℃ B.20℃~30℃ C.25±5℃ D.(20~30)℃
A.4/5 B.2/3 C.3/4 D.1/2