单项选择题
A.0.2MPa B.0.35MPa C.0.5MPa D.1MPa
A.≤1% B.≤5% C.≤10% D.≤20%
A.≤1% B.≤2% C.≤3% D.≤4%
A.≤1% B.≤2% C.≤1KN D.≤10KN
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