具有迟发性神经毒作用的农药是()
A.有机磷
B.有机氯
C.有机汞
D.拟除虫菊酯类
E.氨基甲酸酯类
参考答案:A
Brave New World describes a promising future _______ there is no war or violence and all the people can live happily.
A.where
B.which
C.that
D.whom
细菌“核质以外的遗传物质”指
A.mRNA
B.核糖体(核蛋白体)
C.质粒
D.异染颗粒
E.性菌毛