[填空题]
Vanadium and titanium are both commos mroxk j+ yfv3k09;9o(aro3 qn mehc+w 5exg7:g s,gj.rftals in aerospace engineering because thjrcg75. , g :g+whxefsey have a high strength to weight ratio.
1.vanadium has a melting point than titanium.
2.Titanium and vanadium are both able to conduct electricity. Explain how this is possible.
3.Tin is not a good choice for use in aerospace engineering. Predict, with a reason, why this is so.