单选题What is meant by the term two-blocked（）.AThe bottom block touches the top blockBThe line has jumped the sheavesCThere are turns in the fallDYou have two blocks
单选题
What is meant by the term two-blocked（）.
A
The bottom block touches the top block
B
The line has jumped the sheaves
C
There are turns in the fall
D
You have two blocks
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