The backrest should offer firm support, especially in the lumbar (lower back) region, should be 12- 19 inches wide, and should be easily adjustable both in angle and height, while sitting. The optimum angle between seat and back should permit a working posture of at least [...] degrees between the spine and thighs.
Answer
90
Question
The backrest should offer firm support, especially in the lumbar (lower back) region, should be 12- 19 inches wide, and should be easily adjustable both in angle and height, while sitting. The optimum angle between seat and back should permit a working posture of at least [...] degrees between the spine and thighs.
Answer
?
Question
The backrest should offer firm support, especially in the lumbar (lower back) region, should be 12- 19 inches wide, and should be easily adjustable both in angle and height, while sitting. The optimum angle between seat and back should permit a working posture of at least [...] degrees between the spine and thighs.
Answer
90
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Parent (intermediate) annotation
Open it egion, should be 12- 19 inches wide, and should be easily adjustable both in angle and height, while sitting. The optimum angle between seat and back should permit a working posture of at least <span>90 degrees between the spine and thighs. <span>