衰减
3.rain attenuation
7.atmospheric attenuation of infrared radiaton
8.internal friction and ultrasonic attenuation
10.Experiments were carredd out on the curarized intact rats under arti- ficial respiration. There was a natural attenuation of magnitude cf mya- cardiac action potential(AP)with time. An average natural depression of magnitude of myocardiac AP of 8% at 10′ 17% at 20′ 20% at 30′ and 25% at 40′ was observed.
