单项选择题
A.2 B.3 C.4 D.6
A.1MPa B.5MPa C.0.5MPa D.10MPa
A.300mm B.400mm C.500mm D.550mm
A.0.05L、±20% B.0.5L、±20% C.0.05L、±25% D.0.5L、±25%
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