【简答题】某河流的渔业资源变化是由:①污水排放量;②人口;③江水流量三个因子及变化趋势共同决定的,下面是该河某河段的这三个因子变化趋势图,④线是该河段渔业资源变化。读图回答第11~12题。 11.在(5)时间段中,可以得出的结论是( ) A.人口和污水排放量在这个时间段对渔业资源有很大的影响 B.严格控制污水排放量是提升渔业资源的重要措施 C.严格控制人口数量是提升渔业资源的关键 D. 如果人口和污水排...
【简答题】Long ago, near the village of Hedley, there lived a strange and playful trickster(骗子), known as the Hedley Kow. Sometimes it looked like an ordinary object. Sometimes it looked like a donkey or a goat...
【判断题】计算机正常工作时突然断电,存储在硬盘上的程序和数据会完全丢失。
【简答题】There were many plants in a forest. When spring came, a pine tree saw a red rose nearby and said, "What a beautiful flower! I wish I were that lovely. " The rose proudly said, "It seems that I am the ...
【判断题】内皮和间皮是分布在不同部位的同一种上皮。
【简答题】供氧制度的目的是使冶炼过程能达到适时化渣、减少()、缩短冶炼时间及准确拉碳等。
【判断题】供氧制度的目的是使冶炼过程能达到适时化渣、减少喷溅、缩短冶炼时间及准确拉碳等。
【单选题】That plant looked as if it ___ for a long time.
【判断题】内力影响线与内力图的不同之处仅在于内力影响线竖标与内力图竖标的量纲不同。