Many species of alien marine organism were introduced to China by intentional introduction for their economic or social significances or by unconscious activities such as ballast water discharge.
外来海洋生物是基于某一物种所具有的经济或社会意义而从外地有目的地引进，或者由于无意识的活动如航运业中的船体附着以及压舱水的排放等而带入的。
This thesis gives a detailed introduction of a pithy formula, which applied to estimate discharge energy and discharge resistance of shunt capacitor, with the help of experience coefficient.
介绍了用经验公式估算无功并联电容器的放电能量和放电电阻的口诀。
An introduction is given to the factors that affect the intensity of slag discharge from the gasifier and the method for the calculation of the intensity of slag discharge.
介绍了影响煤气炉排渣强度的因素和计算排渣强度的方法。
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