单选题The greatest strain，when lifting a load with the jumbo purchase，is on（）.Aall of the parts，dividing the load equallyBthe hauling part because it must absorb the frictional losses of all the sheavesCthe parts in the movable blockDthe standing part because it is directly connected to the weight
单选题
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
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