【单选题】堆石坝和干砌石坝最明显的特点( )。
D.
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【多选题】在基础混凝土浇灌前应先进行 ( )工作。
【简答题】英译汉:“The microwave communication channel has a very large bandwidth and will accommodate thousands of telephone conversations or dozens of television channels at once.”
【判断题】(高中)判断本句英译汉的表达是否正确。 Trading companies need to ensure their ability to handle orders efficiently, making an online system an essential sales channel. 翻译:贸易公可需确保拥有高效处理订单的能力,使在线系統成为重要销售渠道。
【单选题】用于农药或土壤有机质、土壤全氮量等项目分析需要通过( )目孔径筛。