【简答题】在确定列管式换热器冷热流体的流径时,通常蒸汽走管________(内或外),高压流体走管________,易结垢的流体走管________,有腐蚀性流体走管________,黏度大或流量小的流体走管________。
【单选题】His watch is ______ cheaper than mine. [ ]
【单选题】I don't think that his watch is ______.
【简答题】随着人类对温室效应和资源短缺等问题的重视,如何降低大气中CO 2 的含量及有效地开发利用CO 2 ,引起了各国的普遍重视.目前工业上有一种方法是用CO 2 来生产燃料甲醇.一定条件下,在体积为3L的密闭容器中,一氧化碳与氢气反应生成甲醇(催化剂为Cu 2 O/ZnO): CO(g)+2H 2 (g) CH 3 OH(g) 根据题意完成下列各题:反应达到平衡时, (1)平衡常数表达式K=______...
【单选题】Look! His watch is quite different _____! [ ]
【简答题】在确定列管式换热器冷热流体的流径时,通常蒸汽走管________,高压流体走管________,易结垢的流体走管________,有腐蚀性流体走管________,黏度大或流量小的流体走管________。(填内、外)
【单选题】His watch is _______ by hand, not by machine, so it is very expensive.