提出了挖掘机动臂重量及重心位置的新的计算方法，结果精确可靠，该方法也适合于计算其它复杂的空间封闭箱型结构的有关机械力学特征。
A new method of calculating the weight and center of gravity of boom of excavator is put forward, which has accurate and reliable result.
利用自动测汞仪和动力学通量箱技术，对武汉市某生活垃圾填埋场封闭的扩建部分向大气释放汞的途径进行了研究。
Using the automated mercury vapor analyzer and dynamic flux chamber(DFC) method, the pathways of mercury emissions to atmosphere were measured at a closed landfill in Wuhan, China.
手烧锅炉烟气被风机牵引，进入封闭的水浴箱处理，其除尘效率达81%。
Dust is drawn by induced draft fan form manual boiler and enters sealed water bath case. The dust collection efficiency is 81%.
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