Concentration of fluorine that cause a phototoxicological effect on th

1.	Concentration of fluorine that cause a phototoxicological effect on the plant is
A.	0.1‚âà√≠¬¨‚à´g/m<sup>3</sup>
B.	0.3‚âà√≠¬¨‚à´g/m<sup>3</sup>
C.	0.5‚âà√≠¬¨‚à´g/m<sup>3</sup>
D.	1‚âà√≠¬¨‚à´g/m<sup>3</sup>
Answer» C. 0.5‚âà√≠¬¨‚à´g/m<sup>3</sup>

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