Daily Security Management Question (11.19)
Thread Content
1. In industries such as machinery, instrumentation, light industry, and chemicals, the purification method widely used in projects aimed at purifying and recovering organic vapors such as benzenes, alcohols, esters, and similar compounds is ( ) A. Washing method B. Adsorption method C. Bag filtration method D. Combustion method. 2. Determining the distance to a sound source relies mainly on sound pressure and subjective experience; generally, in free space, for every doubling of the distance, the corresponding sound pressure level decreases by ( ) dB. A.1 B.5 C.6 D.10 Reference**: 1.B 2.C
B---------------C