A.水災(zāi) B.泥石流 C.火災(zāi) D.其它災(zāi)害
A.再生災(zāi)害 B.次生災(zāi)害 C.間接災(zāi)害 D.原生災(zāi)害
A.1/2 B.1/3 C.2/3 D.1/4