【简答题】以低碳钢为代表的金属材料在拉伸加载下,一般用什么曲线来表征响应过程,曲线上有哪些主要强度和变形指标?
【简答题】氢气被公认是21世纪替代矿物燃料的理想能源,试简述氢气作为能源的三个主要优点:①______;②______;③______.
【判断题】万向联轴器主要用于两轴相交的传动。为了消除不利于传动的附加载荷,可将万向联轴器成对使用。
【简答题】It is politely requested by the hotel management that radios ______ after 11 o’clock at night. A) were not played B) not to play C) not be played D) did not play
【简答题】要保证我国海洋科技事业的快速、健康发展,首要的任务是制定好指导海洋科技事业发展的总方针、总计划,即( )。 A. 21 世纪海洋科技发展规划 B. 21 世纪海洋科技发展战略 C. 21 世纪海洋科技发展蓝皮书 D. 21 世纪海洋科技发展白皮书
【单选题】________, we are airmailing you our latest quotation sheet for your consideration. A. As request B. At your request C. At requested D. As you requested