单项选择题

Stainless steel is material commonly used for temperatures up to 50℃; beyond that and for severe corrosive conditions other materials are requiredThe bold and italic word “that” probably means （）.

A.stainless steel
B.temperature
C.50℃
D.other materials

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单项选择题

Provision must be made in pipe systems for changes in length due to change of temperatureThe bold and italic word “provision” probably means （）.

A.flanges
B.nuts
C.expansion joints
D.bolts

单项选择题

Cast iron and gunmetal fittings are used freely in small sizes at moderate pressure; large fittings, those for high pressure and temperature are cast or mild steelIn the above sentence, the word “those” means （）.

A.east iron firings
B.mild steel fittings
C.small fittings
D.large fittings

单项选择题

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