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【单选题】
一铰盘有三个等长的柄，长度为L 相互夹角为120°，如图所示。每个柄端作用于一垂直手柄的力P 。将该力系向BC 连线的中点D 简化，其结果为（ ）。
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A.
V = P，M = 3PL
B.
V= 0，M = 3PL
C.
V= 2P，M= 3PL
D.
V = 0，M = 2PL
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】After the birth of my second child，I got a job at a restaurant.Having worked with an experienced 16for a few days，I was 17to wait tables on my own.All went 18that first week.When Saturday night came，I...
A.
repeated
B.
discovered
C.
corrected
D.
described