在使用危险品之前，请遵守以下注意事项：
A.Before you use dangerous materials, obey these precautions. B.Before you use dangerous materials, omit these precautions. C.Before you use dangerous materials, disobey these precautions.正确答案A
在使用危险品之前，请遵守以下注意事项：
A.Before you use dangerous materials, obey these precautions. B.Before you use dangerous materials, omit these precautions. C.Before you use dangerous materials, disobey these precautions.正确答案A
