将抗体吸附于红细胞上检测抗原的试验是（）。
A.直接凝集
B.间接血凝
C.间接凝集
D.血细胞凝集抑制试验
E.协同凝集
参考答案：B
She tried to finish all the work in one day but finally _____ and had to take a rest. [ ]
A. broke away
B. broke up
C. broke down
D. broke out
导致女方不孕最常见的因素是( )。
A．子宫因素B．子宫颈因素C．输卵管因素D．外阴、 * * 因素E．排卵因素
