Municipal solid waste (MSW) are produced directly from homes.
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landfill may cause groundwater pollution.
A. 对
B. 错
incineration may cause air pollution
A. 对
B. 错
The methods for solid waste disposal are ______, ________,__________.
等截面悬臂梁改成等强度梁后,在同样的截荷作用下,其最大挠度和转角将( )。
A. 增大
B. 减小
C. 不变