【简答题】填料选择的原则是_________________________________________。
【判断题】填料塔选择填料的原则是:单位体积填料的表面积要大;气液两相接触的自由体积要大;空隙截面积要小;质量要轻、机械强度要高。
【单选题】听力原文:Little old ladies competing at dumpling-making contests, butchers chopping large chunks of meat basketballs by the dozen. Five million people a week shop at Wal-Mart stores in China.And if the Am...
A.
It's a Taiwanese supermarket chain.
B.
The world largest retailer has agreed to buy Trust-Mart.
C.
Wal-Mart will buy Trust-Mart for 1 billion yuan.
D.
Buying Trust-Mart will make Wal-Mart the biggest food and department store network in China.
【单选题】It will be fun ____ dumpling. [ ]
【单选题】对填料的选择原则错误的是()。
A.
单位体积填料的表面积要大,气液相接触的自由体积要大
C.
质量要轻,机械强度要高,耐介质腐蚀,经久耐用,价格低廉
【判断题】线性规划问题是求一个 线性目标函数 在一组 线性约束 条件下的极值问题。