单项选择题

‎原发性纵隔肿瘤症最常见症状‏

A．发热、盗汗
B．重症肌无力
C．咳嗽、咳血
D．胸闷胸痛

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单项选择题

Which of the following statements is true according to the video

A． Daily service tank is the largest tank on board.
B． The fuel oil tank is larger than diesel oil tank.
C． The bilge tank under the engine room may contain oil.
D． The sewage tank is same as the bilge tank.