五、請問人體的酮體有哪些？酮體如何生成？甚麼情況容易過量？過量對健康的影響？如何避免過量？(10分)

1. Let two layers of fluid be dragged along by motion of an upper plate as shown in Fig. The bottom plate is stationary. The top fluid puts a shear stress on the upper plate, and the lower fluid puts a shear stress on the bottom plate. Determine the ratio of these two shear stresses. (20％)