The solid waste was charged into the incinerator through （）. ["the solid waste dump chute","an access door","the same way for waste oil burners","a changing opening"]
下列关于悬挂国旗的做法，错误的是（）。 ["在建筑物上悬挂国旗，应日出升旗，日落降旗","悬旗致哀时，通常做法是降半旗，即先将旗升起来至杆顶，再下降至距杆顶相当于杆长二分之一的地方","悬挂双方国旗，通常是。以右为上，左为下","升挂国旗，应将国旗置于显著的位置"]
在分时操作系统中，进程调度经常采用（）算法。 ["先来先服务","最高优先权","时间片轮转","随机"]
If plastic film insulation becomes damaged in air conditioning system, （） may form within the film. ["evaporation","condensation","liquefies","vaporizatio"]
电波途经建筑物、树木等受阻被衰减，阴影遮避对电波传播影响大的是（）。 ["所有的卫星移动通信系统","陆地卫星移动通信系统","海事卫星移动通信系统","航空卫星移动通信系统"]
利用电感滤波的原理是什么？
