*/*_For a self-locking machine, the efficiency should be?

1.	/_For a self-locking machine, the efficiency should be?
A.	Less than 60%
B.	50%
C.	More than 50%
D.	None of these
Answer» B. 50%

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*/*_For a self-locking machine, the efficiency should be?

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/_For a self-locking machine, the efficiency should be?