The greatest strain，when lifting a load with the jumbo purchase，is on（）.<br>A:all of the parts，dividing the load equally<br>B:the hauling part because it must absorb the frictional losses of all the sheaves<br>C:the parts in the movable block<br>D:the standing part because it is directly connected to the weight

The greatest strain，when lifting a load with the jumbo purchase，is on（）.
A:all of the parts，dividing the load equally
B:the hauling part because it must absorb the frictional losses of all the sheaves
C:the parts in the movable block
D:the standing part because it is directly connected to the weight

出自：海船船员证

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