由于以往已了解到湄公河上游中国云南境内澜沧江流域有拟钉螺分布，故自1981年开始进行调查。
Being aware of the distribution of Tricula snails in the basin of Lanchang River (the upper reaches of Mekong River) in Yunnan Province of China, investigations were carried out since 1981.
由于传统的PID调节器的操纵性能不能令人满意，故本文提出一种应用模糊推理功能实现PID参数自整定的控制。
In this paper, the fuzzy controller of PID parameters self-adjustment is proposed, it can automatically adjust PID parameters according to ship dynamic feature.
在风积砂地层修建隧道，由于开挖扰动后围岩完全变为松散体，无自稳能力，故施工难度大。
Tunneling in wind stockpiling fine sand is very difficult, since the sand undermined will become very loose and incapable of self-consolidating.
具有良好的自吸性，故每次开泵前无须灌入液体。
Have good self-priming, and so every time there is no need to open before the pump filled with liquid.
具有良好的自吸性，故每次开泵前无须灌入液体。
Have good self-priming, and so every time there is no need to open before the pump filled with liquid.
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