如图所示,使一薄钢条的下端固定,现分别用不同的它,F l = F 3 = F 4 > F 2 ,使其发生( a)、(b)、(c)、(d)各图中所示的形变,能说明力的作用效果与力的作用点有两是( )
A.
ab
B.
bd
C.
ad
D.
ac
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