— ____ visited the Shanghai World Expo is sure to tell you the place is worthy ____ twice．

— You can say that again．

A．Those who have; visiting

B．Whoever has; visiting

C．Those who have; to be visited

D．Whoever has; to be visited

除氧循环泵额定电流为（）A，转数为：（）；锅炉给水泵额定电流为（）A，转数为：（）。