单项选择题
A.≥0.4MPa B.≥0.5MPa C.≥0.6MPa D.≥0.8MPa
A.8MPa B.15MPa C.18MPa D.20MPa
A.0.5MPa B.0.4MPa C.0.35MPa D.0.3MPa
A.≤30% B.≤25% C.≤20% D.≤10%
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