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【单选题】
On the cross-section that is exerted a concentrated moment force P for the beam, _____.A.
there is a sudden jump in value in the Q diagram, and the M diagram is smooth and continuous
B.
there is a sudden jump in value in the Q diagram and a sharp angle in the M diagram
C.
there is no sudden jump in value in the Q diagram, but one in the M diagram
D.
there is no sudden jump in value in the Q diagram, but a sharp angle in the M diagram
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