【单选题】Up to now, no one has come up with a(n) explanation of why dinosaurs died out, and it remains a mystery.
【单选题】How men first learned to invent words is unknown; 【B1】 , the origin of language is a mystery. All we really know is that men, unlike animals, somehow invented certain 【B2】 to express thoughts and feel...
【多选题】一般工程图纸都是按正投影的原理绘制,以下为正投影特征的是
【简答题】海藻主要分为四大类,分别为 1 、 2 、 3 和 4 。另外,还包括硅藻、甲藻、金藻等微藻。
【单选题】神经网络用遗传算法进行优化的核心原理是:
【单选题】The underlined word “deity” in the third paragraph refers to
D.
overexposure to the sun.
【单选题】les jours( )d'un vol myste/rieux.