单项选择题
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°
A.增大 B.减小 C.不变 D.无法判断
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