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【单选题】
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
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【多选题】绝对密实体积与自然状态体积的比率,定义为材料的密实度,同一材料的密实度和孔隙率之和为1。计算孔隙率的公式是()。
A.
ρ=Vo-V/Vo×100%
B.
ρ=(1-m/P×Po/m)×100%
C.
ρ=(1-m/P×m/Po)×100%
D.
ρ=(1-Po/P)×100%