题目:载荷中心距,即在货叉上放置标准货物时,其( )到货叉垂直段前壁的水平距离。 Load center distance refers to the horizontal distance between the front wall of the vertical section of the fork when placing standard goods on the fork.
A. 垂心 orthocenter
B. 重心center of gravity
C. 外心circumcenter
D. 内心incenter
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