單項選擇題Maximum and minimum working temperatures must be considered when choosing the joint, which must be so installed that it is neither over-compressed nor over-extendedThe bold and italic word "which "probably means （）.

A.maximum working temperature
B.minimum working temperature
C.the joint
D.the insulating material


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4.單項選擇題Wrought iron has an inherent resistance to corrosion but is not to be had freely , its place has been taken by the cuprous alloysAccording to the above sentence , which of the following statements is true?（）

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

5.單項選擇題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?（）

A.Both seamless mild steel and copper may be used for middle pressure steam
B."hpair" means high pressure air
C.The feed piping of the boilers can be made of seamless mild steel
D.All oil pipings are made of mild steel