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【多选题】
套管式冷凝器的特点有（ ）。A.
结构简单
B.
冷却水与制冷剂呈顺流式
C.
套管长度较大时，下部管间易被液体充斥，传热面积不能得到充分利用
D.
只用于小型氟利昂制冷装置
E.
换热效果好
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举一反三
【单选题】They ______ on the program for almost one week before I joined them, and now we _____on it as no good results have come out so far.
A.
had been working; are still working
B.
had worked; were still working
C.
have been working; have worked
D.
have worked; are still working
【简答题】They _______ on the program for almost one week before I joined them,and now we _______ it as no good results have come out so far. A．had been working; are still working B．had worked; were still wor...
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