【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 ______.
【单选题】携带β一棒状杆菌噬菌体的白喉杆菌能产生白喉毒素,这种现象称为
【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.