A.27mm
B.30mm
C.33mm
D.36mm
[单选题]A.740B.670C.650D.620
[单选题]A.7.07tB.7.83tC.8.13tD.8.56t
[单选题]A.35/26B.37/26C.39/28D.41/28
[单选题]A.B.C.D.
[单选题]A.充分必要条件B.充分条件而非必要条件C.必要条件而非充分条件D.既非充分又非必要条件
[单选题]A.换热功率B.传热面积