机械工程
screw
The paper provides a set of entire design principle about the semi-hermetic screw compressor and water chiller.
本文为半封闭螺杆压缩机和冷水机组提供了一整套完整的设计方法。
医药科学
snail
ResultsThe snail area declined by 143.40 hm2,with a decline rate of 58.15%. The density of living snails and the infection rate of snails decreased by 96.83% and 100%,respectively.
结果钉螺面积减少143.40 hm2,下降率为58.15%,活螺平均密度下降96.83%,钉螺感染率下降100%,人群感染率和耕牛感染率分别下降76.79%和90.11%。
生物学
paludina
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