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超声探头须具有一定的技术特性，下列哪一项是不正确的？（ ）
根据职业兴趣理论，属于（ ）职业兴趣类型的人善于和人相处，喜欢教导、帮助、启发或训练别人。
用十六进制表示Visual Basic的整型常数时，前面要加上的符号是（）
ZPW-2000A型无绝缘移频自动闭塞区段禁停标志牌设置在调谐区外方，距调谐单元中心（）mm的位置。
应安装列尾装置而未安装发出列车，但未构成一般c类以上事故时，列（）事故
职业活动
导游员对所有的客人应该一视同仁、平等对待指的是个别要求的处理原则中一视同仁原则。 ( )
道岔区轨枕埋入式无砟轨道，底座混凝土裂缝限值0.3mm，不允许出现竖向贯通裂缝。
男性，55岁。下颌前牙出现剧烈疼痛、出血3天。口腔异味明显。患者吸烟多。口腔检查：唇侧龈缘如虫蚀状，覆有灰褐色假膜，可擦去，留下出血面。龈乳头和边缘龈呈直线刀切状。无松动，无牙周袋。口腔内有特殊腐败臭味。颌下淋巴结肿大压痛。可能的诊断是（）。
下列行为中，属于具体行政行为的有（）。
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