13轴的半径为R,长为L,剪变模量G,受扭后圆轴表面的纵向线倾角为α,则在线弹性小变形范围内τmax和单位长度扭转角θ分别为:
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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