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【单选题】
在空调系统中，计算泵的（）应考虑回路中设备及管道的压降。A.
回压
B.
升压
C.
回程
D.
扬程
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【单选题】The field research will take Joan and Paul about five months; it will be a long time ____ we meet them again.
A.
after
B.
before
C.
since
D.
when
【单选题】The field research will take Jone and Paul about five months; it will be a long time ____ we meet them again. [ ]
A.
after
B.
before
C.
since
D.
when
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