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【多选题】
关于均布荷载q、剪力Q、弯矩M之间的微分关系，下列叙述正确的有()。A.
无荷载区段，M为直线;
B.
受匀布荷载q作用时，M为抛物线，且凸向与q方向一致;
C.
受集中荷载P作用时，M为折线，折点在集中力作用点处，且凸向与P方向一致;
D.
受集中力偶m作用时，在m作用点处M有跳跃(突变)，跳跃量为m，且左右直线均平行。
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A.
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B.
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C.
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D.
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E.
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