解磷定和氯磷定对哪种有机磷中毒疗效差()
A.内吸磷
B.对硫磷
C.甲胺磷
D.甲拌磷
E.敌百虫
参考答案:E
Most of the teachers are impressed on some students due to their _____________ characters, such
as cleverness, confidence and honesty. [ ]
A. actual
B. potential
C. steady
D. average
接户线施工时,()。
A、周围土壤无突起
B、导线不应松弛
C、每根导线接头不应多于1个
D、须用同一型号导线相连结