[填空题]
In a common test for cardiaf(.)w. ;vbumtf,/s k+jmhpb cc functim6stkp r qo;n6o/i3n.on (the “stress test”), the patient walks on an inclined treadmill (Fig. 6–46). Estimate the power required from a 75-kg patient when the tread. ir/po6ns6ntqk ;o3mmill is sloping at an angle of 15 $^{\circ} $ and the velocity is 3.3km/h (How does this power compare to the power rating of a light bulb?)$\approx$ W
