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【单选题】
控制阀理想流量特性主要是指阀的前后压差恒定时,流体通过阀门的相对流量与相对开度之间的关系,其特性主要取决于( )A.
阀的气开气关形式
B.
阀的口径
C.
阀芯形状
D.
阀的执行机构的正反作用
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举一反三
【单选题】Which of the following is not the reason why we feel time-stressed ?
A.
technology
B.
information explosion
C.
rising prosperity
D.
too much work to do
【单选题】6A-3. Which one is not mentioned by the author as a reason that contributes to the prosperity of the travel industry?
A.
Some consumers are positioned to sell and seek bargains.
B.
The rising of middle and upper classes in Asia and their purchase power.
C.
Technology injects new vitality into the industry and makes creativity possible.
D.
The participation and intermediary function of smart young travel retailers.
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