某A型血的人因受伤导致流血过多,需要大量输血,在血源充足的情况下,医生应给他输( )
A.O型血
B.AB型血
C.B型血
D.A型血
答案:D
It is not always easy for the public to see _____ use a new invention can be of to human life. [ ]
A. whose
B. what
C. which
D. that
在申请等级评定时,即使已经提交过且未发生变化的材料也必须重新提交。