Answer: Pulmonary aortic valve
Explanation:
Answer:
To test the presence of protein in the food substance which gives a blue-to-purpule colour
Coefficients of Absorption for Common Materials
Perforated acoustic ceiling material 60%
Heavy curtains 50%
Carpeting 20%
Wood 5%
Plaster 3%
Clay tile 3%
Concrete 2%
The answer is C. Heavy curtains
Its true.......................................................