采用“施工特定行车办法”行车，显示引导手信号，列车以不超过（）km/h速度进站或通过。
A.20
B.30
C.45
D.60
参考答案：D
我国目前缩窄性心包炎最常见的病因是（）
A.化脓性
B.肿瘤性
C.结核性
D.非特异性
E.病毒性
The rain was very heavy and ______ the land was flooded.
A. consequently B. continuously C. constantly D. consistently
