曲柄存在的条件是连架杆与机架中必有一个是最短杆，且最短杆与最长杆长度之和（）其余两杆长度之和。
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The cooling system（） needs least maintenance work for in this kind of system（）
A. open；the minimum components
B. open；the high cooling efficiency
C. central；there are more coolers and a extra set of pumps
D. central；there is only one component contacts seawater
What are three of the fields used in defining a CSQ in IPCC Express Enhanced?（）
A. WrapUp Time
B. Service Level
C. Overflow CSQ
D. Agent Name
E. Automatic Work
F. CRS Applicatio
在七言律句“仄仄平平仄仄平”中，如果第三字由“平”变“仄”为拗句，问如何救法？
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