RIA试剂盒中,常用来标记抗原的是()。
A.131I
B.123I
C.125I
D.32P
E.111In
参考答案:C
已知三角形的三边长分别是3n,4n+28,5n+26,当n=( )时,这个三角形是直角三角形。
It suddenly___ to me that we could use the computer to do the job.
A.stroke
B.occurred
C.happened
D.saw