单项选择题
A.0.1mm B.0.2mm C.0.3mm D.0.4mm
A.100℃ B.105～110℃ C.120℃ D.125～130℃
A.≥0.040% B.≥0.050% C.≥0.060% D.≥0.070%
A.≥0.020% B.≥0.030% C.≤0.020% D.≤0.030%
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