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【单选题】
热油和套管换热器中换热,20°C升至70°C。热油由100°C降至60°C,则逆流时的对数平均温度差为:A.
35℃
B.
30℃
C.
80℃
D.
85℃
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【单选题】It is said that two supermarkets, ______ are being built in my hometown, will open next year.
A.
they both
B.
which both
C.
both of them
D.
both of which
【单选题】It is said that the two wountries ____
A.
have been in the war
B.
are on the war
C.
have been in the state of war
D.
are in a state of war
【单选题】It is said that two supermarkets, ______ are being built in my hometown, will open next year. A. they both B. which both C. both of them D. both of which
A.
they both
B.
which both
C.
both of them
D.
both of which
【简答题】给出图列所属的OSPF网络类型。 1 ( ) 2 ( ) 3 ( ) 4 ( )
【简答题】It is said that two ____( 直 升 机) and several Coast Guard boats searched until midnight without finding anything.
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