单项选择题
A.10～20 B.11～21 C.12～20 D.12～21
A.1.16～1.22 B.1.17～1.23 C.1.16～1.23 D.1.17～1.22
A.1.24±0.01 B.1.25±0.01 C.1.26±0.01 D.1.27±0.01
A.2.2v B.2.0v C.2.4v D.2.6v
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