[填空题]
A person standing a certain distance from an airpld2s2,a5jaarmoj(rcejj w*6 1aneqt 03g ovjvf0mm4oh2e*r4cs7 with four equally noisy jet engines is experiencing a sound level bordering on pain, 120 dB. What sound level would this person experience i og 2smv m4tcj0fv0he*or347qf the captain shut down all but one engine? [Hint: Add intensities, not dB’s.] dB
