A.8 B.12 C.16 D.20
A.黑色 B.白色 C.棕色 D.黄色
A.20h B.24h C.26h D.29h
A.1% B.2% C.3% D.4%
A.300~600nm B.600~1000nm C.1000~1200nm D.1200~1500nm