The_hydrometer_are_generally_calibrated_at____________

• A. 35¬¨¬®‚Äö√†√ªc
• B. 27¬¨¬®‚Äö√†√ªc
• C. -35¬¨¬®‚Äö√†√ªc
• D. -27¬¨¬®‚Äö√†√ªc