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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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【单选题】20160105某种商品若按标价出售,相比进价成本每件可获利50%,若按标价的8折出售,则每件可获利 (5) 。
A.
0.2
B.
0.25
C.
0.3
D.
0.4
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B.
把人类分成技术繁殖和自然繁殖，挑战人类生存法则
C.
有可能导致近亲配婚
D.
患遗传性疾病的危险增加