_The maximum efficiency of a screw jack is$? – McqOptions

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1.	_The maximum efficiency of a screw jack is$?
A.	(1 - sin≈ì√ú)/(1 + sin≈ì√ú)
B.	(1 + sin≈ì√ú)/(1 - sin≈ì√ú)
C.	(1 - tan≈ì√ú)/(1 + tan≈ì√ú)
D.	(1 + tan≈ì√ú)/(1 - tan≈ì√ú)
Answer» B. (1 + sin≈ì√ú)/(1 - sin≈ì√ú)

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