【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 ...
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
【简答题】阅读理解。 Paper Plane to Be Dropped from Space For most people, it is enough to see their paper planes fly for a few feet. The Japanese, however, want to make a paper plane fly for 240 miles from space. T...