【单选题】. A decline in electricity output forces industrial estates and cities to burn more coal and give out more carbon to _________ the shortfall.
【简答题】电动机的连续运转电路具有 、 、 环节。
【单选题】A _______ of smog covers these industrial cities.
【单选题】According to the passage, the Industrial Revolution is responsible for the following re-suits except______.
【单选题】下图是机箱面板连线的连接示意图,图中RST表示()
【单选题】Air pollution, together with littering, ____ many problems in our large industrial cities today.