单向琼脂扩散法最常用于
A．抗体定性
B．抗体定量
C．抗原定性
D．抗原定量
E．免疫复合物定量
参考答案：D
--Do you know what caused the accident? --- No, not yet. The matter _____.
A．is being looked into
B．was being looked into
C．looked into
D．is looked into
地方公务交通补贴标准不得高于中央和国家机关补贴标准的（）%。
A.30
B.50
C.20
D.40
