1.

The_efficiency_of_the_a_screw_jack_is_maximum,_when$

A. α = 45<sup>0</sup> + ɸ/2
B. α = 45<sup>0</sup> – ɸ/2
C. α = 90<sup>0</sup> + ɸ
D. α = 90<sup>0</sup> – ɸ
Answer» C. ‚âà√≠¬¨¬± = 90<sup>0</sup> + ‚Äö√Ѭ∂‚Äö√†√®


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