【单选题】下面是一个计算圆面积的程序,在编译时出错,原因是_____________。
【单选题】政府机构申请的订阅号做认证时,需要缴纳多少元的认证费用
【简答题】Tourism is one of the great promising industries of the last few years. In most countries there are official organizations to encourage tourists. In fact, very often the ordinary people are worse off ...
【简答题】计算机按字长可分为 ___________ 位机、 ___________ 位机、 ___________ 位机和 位机等 2. 计算机按结构可分为 ___________ 、单板机与多芯机,多板机等。 3. 计算机辅助设计的英文缩写是 ___________ 。
【简答题】Tourism is one of the most promising industries of the last few years. In most countries there are official organizations to encourage tourists. In fact, very often the ordinary people are worse off b...
【单选题】政府机构申请的订阅号做认证时,需要缴纳多少元的认证费用
【简答题】在 1 米管长的冷却器中用 12 °C 冷水将油品从 147 °C 冷却到 97 °C ,冷水被加热到 37 °C ,两流体并流流动。求:欲使油品出口温度降至 77 °C ,管子需增加多少米?(上述各工况油、水的流量、入口温度及所有物性常数均不变,忽略热损失。) 。