【简答题】某种纱线的细度表示为15tex×3,请说出它的含义。
【单选题】A clean environment can help the city bid for the Olympics, which will promote its economic development. [ ]
【单选题】普通货船装运矿石时,主要应注意船舶的()。
【单选题】普通货船装运矿石时,主要应注意船舶的 。
【判断题】调好滴定管0刻线后,在滴定操作前需将管尖残液除去,方法:用干净小烧杯内壁轻触滴定管尖嘴即可。
【单选题】A clean environment can help the city bid for the Olympics, which ________ will promote its economic development.