Qian Xuesen is a great Chinese scientist ______ great contributions (贡献) to building our motherland. [ ]

A. which has made

B. which have made

C. who has made

D. who have made

战伤伤员现场急救中，最重要的措施是（）。

A.判断伤情

B.保持循环稳定

C.保持呼吸道通畅

D.早期应用抗生素

E.镇痛