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【单选题】
圆轴受集度为m。的均布扭转力偶矩作用，如图所示。则该轴的刚度条件有四种答案，正确的是( )。A.
m q /(GI p )≤[φ']
B.
m q l/(GI p )≤[φ']
C.
m q l/(2GI p )≤[φ']
D.
2m q l/(GI p )≤[φ']
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