A. 加温 B. 降温 C. 熔化 D. 保温
A. 偿还性 B. 流动性 C. 收益性 D. 暂时性 E. 安全性
A. 正确 B. 错误
A. a vessel towing by pushing ahead B. a power-driven vessel,not towing C. a barge being pushed ahead D. either answer A or answer B