A.饱和碳氢化合物比不饱和的碳氢化合物的毒性大
B.不饱和的碳氢化合物比饱和碳氢化合物的毒性大
C.不易蒸发的石油产品比易挥发的石油产品的毒性品
D.芳香族碳氢化合物大多数不具有毒害性
This students’ phone is_______
A.approved of by the majority
B.disapproved of by the majority
C.rejected by middle school students
D.opposed by the parents of the callers