投毒
2.they feared some undetected trace of poison; she looked around to be sure her faux pas was undetected.
3.The LC50 on fries of red crucian carp and tadpole were 171.13mg/L and 72.77mg/L respectively, the coefficient of ground bait were 5.84 and 13.74. The EC had low toxicity on fish and frog.
4.The LC50 on Apismelliferal L were 1659.96mg/L and 9213.06mg/L by intake and spraying methods, the coefficient of ground bait were 0.60 and 0.11. The toxicity of the EC was low on bee.
5.Results:The eat index to bait was 0.75,>0.5,the rodent density decreased from 42.99 % to 2.55 % after 2 weeks,the deratiza-tion was 94.07%.
6.In Daqinggou Natural Preserve,four kinds of methods were adopted to control Myospalax aspalax Pallas with brom phosazetim. The total area added up to 2 470 hm~2,the controlling effect reached 83%,the average cost for controlling each one was 0.90 yuan.
7.This paper presents a tele-communication network which transmits hydrological informations from several distant water-gates to the administrative office by means of microcomputers. The longest distance of transmission is 11.5 km. The network consists of some Tp801 microcomputers inlet and outlet interface circuits, SIO series, tele-communication interface circuits, Tp801 D,printed-circuit board,30.5cm green light displays,printers,etc.
