单项选择题
A.Wrought iron can resist liquids flow
B.It is difficult to attain the wrought iron
C.Wrought iron should be combined with cuprous alloys
D.The cuprous alloys have mere disadvantages than wrought iron
单项选择题 Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）
单项选择题 Cast irons weakness in tension and under shock loading limits its use to low pressure steam, air, oil and low speed water fittingsThe above sentence, most probably means （）.
单项选择题 "Cast iron has poor corrosion resistance to sea water, especially in the presence of bronzes" Implies（）.