单项选择题
A.1/2~1/5 B.1/10~1/50 C.2~5倍 D.10~50倍
A.受拉破坏B.受压破坏C.弯曲破坏D.剪切破坏
A.90~105℃ B.100~105℃ C.100~110℃ D.105~110℃
A.45° B.45°+φ/2 C.45°-φ/2 D.60°
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