A.5% B.3% C.1%
A.1/2 B.1/3 C.2/3 D.3/4
A.4個發(fā)育期觀測點(diǎn) B.4個密度觀測點(diǎn) C.4個高度觀測點(diǎn) D.8個密度觀測點(diǎn)