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【单选题】
一个长为L、质量为M的链条放在水平桌面上，其中1/3的长度由桌边下垂。现在一水平拉力的作用下，将链条全部匀速拉上桌面，如图所示. 根据变力做功公式计算拉力所作的功为多少？桌面与链条的滑动摩擦系数为【图片】。【图片】A.
.
B.
C.
.
D.
.
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