单项选择题
A.±0.01g B.±1g C.±0.1g D.±0.2g
A.18-22kPa B.16-22kPa C.16-24kPa D.16-28kPa
A.2 B.4 C.6 D.8 E.10
A.8h B.10h C.12h D.15h
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