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【单选题】
由一简支梁的弯矩图（如图所示）得出、中、右三段上的剪力大小和正负依次是（ ）。【图片】A.
20 kN 、 0 、 -10 kN
B.
10 kN 、 0 、 -20 kN
C.
-10 kN 、 0 、 20 kN
D.
-20 kN 、 0 、 10 kN
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