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选取图层中的某一对象，而这一对象与周围背景的边界不清晰，为了精确选取，我们使用哪些方法可以完成。
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女性，33岁。近1个月来渐出现腰背痛，伴低热、盗汗。既往有肺结核病史。查体：胸11～12棘突明显压痛。诊断确定后，目前不宜采取的治疗措施是（）。
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二尖瓣关闭不全时不出现哪项()
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简述海洋资源管理的宗旨。
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氮气管线使用显眼的（）进行标识，装置有监控系统进行全天安全监控。
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簇状柱形图对于分类的标志更容易鉴别。
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The task of being accepted and enrolled(招收)in a university begins early for some students. Long【C1】______they graduate from high school. These students take special【C2】______to prepare for advanced study. They may also take one of more examinations that test how【C3】______prepared they are for the university. In the final year of high school, they【C4】______applications and send them, with their student records, to the universities which they hope to【C5】______. Some high school students may be【C6】______to have an interview with representatives of the university: Nearly【C7】______, and usually very frightened, they are【C8】______to show that they have a good attitude and the【C9】______to succeed. When the new students are finally【C10】______, there may be one more step they have to【C11】______before registering for classes and【C12】______to work. Many colleges and universities【C13】______an orientation(情况介绍)program for new students.【C14】______these programs, the young people get to know the【C15】______for registration and student advising, university rules, the【C16】______of the library all the other【C17】______services of the college or university. Beginning a new life in a new place can be very【C18】______. The more knowledge students have【C19】______the school, the easier it will be for them to【C20】______to the new environment. However, it takes time to get used to college life.【C1】A．asB．afterC．sinceD．before
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下列哪个产品不属于代理同业业务。（）
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在8×51芯片里，（）引脚用于控制使用内部程序存储器还是外部程序存储器？
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铝合金铆钉头部有两条道表示（）。