正常成年人白天工作时出现的脑电波为
A．α波 B．α波阻断 C．β波 D．δ波 E．θ波
参考答案：C
— How many people are killed in the town in the big earthquake?
— More than 2 _____. [ ]
A. hundred
B. hundreds
C. hundreds of
对实体混凝土表面检查及裂缝有何要求？
