A.10 B.15% C.18% D.20%
A.杜絕鉛中毒 B.防治嬰兒鉛中毒 C.適當(dāng)采取預(yù)防措施 D.能夠識(shí)別嬰兒鉛中毒
A.1/18-1/14 B.1/14-1/7 C.1/7-1/5 D.1/5-1/4