A.2%~3% B.1%~2% C.3% D.4%
A.低溫 B.高溫 C.長(zhǎng)期浸水 D.環(huán)境侵蝕
A.低溫 B.長(zhǎng)期浸水 C.遭受火災(zāi) D.環(huán)境侵蝕