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【单选题】
The bending moment diagram of a simply supported beam is shown in the figure. Segment AB is a quadratic parabola and the bending moment at section B is 2kN·m. The slope has no mutation, and the bending moment diagram of segment BC is an oblique line. Then the external loads on the beam is shown in ( ) .
A.
B.
C.
D.
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】曲线$\left\{\begin{array}{l} x^2+y^2+z^2-3x=0\\ 2x-3y+5z-4=0 \end{array}\right.$在点$(1,1,1)$处的切线方程为( )
A.
$\dfrac{x-1}{16}=\dfrac{y-1}{-9}=\dfrac{z-1}{-1}$;
B.
$\dfrac{x-1}{16}=\dfrac{y-1}{9}=\dfrac{z-1}{-1}$;
C.
$\dfrac{x-1}{16}=\dfrac{y-1}{9}=\dfrac{z-1}{1}$;
D.
以上选项都不对。