艾滋病病毒检测的确证试验通常采用何种检测方法( )
A．竞争法B．免疫印迹法C．化学发光法D．斑点-ELISA法E．斑点免疫渗滤试验
参考答案：B
在黏性土的状态中，液性指数0≤0.25土的状态为（）。
A.硬塑
B.可塑
C.软塑
D.坚硬
Helen hurt her leg while _____ on the playground. We had to send her to the hospital. [ ]
A. played
B. playing
C. was playing
D. is playing
