单项选择题 （ ）又称正面光，其照明方向与照相机的拍摄方向一致。A. 侧光B. 逆光C. 顺光D. 光质

单项选择题 1属于肿瘤特异性抗原的是（）

单项选择题 My friend is a taxi driver. He has been a taxi driver for ten years. It’s a nice job most of the time. He can meet a lot of people. He always works at night because there is too much traffic during the day. He usually goes home between two o’clock in the morning. There are some very strange things, which often happen at night. One day my friend was taking a woman back home from a party at three o’clock in the morning. She had her little dog with her. When they got to her house, she found she had lost her key. So my friend waited in the car with the dog while she climbed in through the window. My friend waited and waited. After half an hour of knocking, he decided to find out what was going on. He tied the dog to a tree and started to climb in through the window. At that moment some policemen came. They thought my friend was a thief. Luckily, the woman came downstairs. She must have gone to sleep and forgotten about my friend and the dog.A.your boatB.the storeC.the shipD.the hotel

单项选择题 抗肿瘤免疫的主要效应细胞是（）

单项选择题 下面与胚胎抗原无关的是（）

判断题 《乘客事务处理单》填写要求办理应急情况下的乘客事务时车站需在《乘客事务处理单》上备注注明事件详情与处理结果，除单程票当天现场办理退票的无需乘客签名，其余均需乘客签名。（ ）

单项选择题 3尚未发现对肿瘤细胞有杀伤作用的免疫细胞是（）

单项选择题 属于肿瘤主动生物治疗方法的是（）

单项选择题 用户请求使用一个已存在的文件时，其正确的操作次序为（）。

单项选择题 文件系统最基本的目标主要是通过（）功能实现的。