第19题: [单项选择]A towing vessel pushing a barge ahead and rigidly connected in a composite unit shall show the lights of(). 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 参考答案:B
第20题: [单项选择]成人颅高压最常见的X线征象是() A. 头颅扩大 B. 囟门增宽 C. 颅缝分离 D. 脑回压迹增多 E. 鞍背疏松脱钙 参考答案:E