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According to the man, how do some bees use their sense of smell
A．To find their way back to the nest.
B．To locate plant fibers.
C．To identify kinds of honey.
D．To identify relatives.
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疑结肠占位性病变时应首选（）
A.直肠指检
B.纤维结肠镜
C.乙状结肠镜
D.X线钡剂灌肠检查
E.活组织病理检查
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有些零件装配后为了确认已装配到位，需要在零件上作特殊标记，表示原始安装位置没有变化，这种标记一般用（）。
A.直线色标
B.连体贯穿色标
C.连体色标
D.印章色标
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已知PbI2的Ksp=9.8×10-9，现将0.01m01·L-1Pb(NO3)2溶液和0.001mol·L-1KI溶液等体积混合，则（）。
A．有PbI2沉淀
B．无PbI2沉淀
C．开始无沉淀，稍后产生PbI2沉淀
D．刚好达到饱和状态
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Passage Two Surprisingly, no one knows how many children receive education in English hospitals, still less the content or quality of that education. Proper records are just not kept. We know that more than 850,000 children go through hospital each year, and that every child of school age has a legal right to continue to receive education while in hospital. We also know there is only one hospital teacher to every 1,000 children in hospital. Little wonder the latest survey concludes that the extent and type of hospital teaching available differ a great deal across the country. It is found that half the hospitals in England which admit children have no teacher. A further quarter have only a part-time teacher. The special children’s hospitals in major cities do best; general hospitals in the country and holiday areas are worst off. From this survey, one can estimate that fewer than one in five children have some contact with a hospital teacher and that contact may be as little as two hours a day. Most children interviewed were surprised to find a teacher in hospital at all. They had not been prepared for it by parents or their own school. If there was a teacher they were much more likely to read books and do maths or number work; without a teacher they would only play games. Reasons for hospital teaching range from preventing a child falling behind and maintaining the habit of school to keeping a child occupied, and the latter is often all the teacher can do. The position and influence of many teachers was summed up when parents referred to them as "the library lady" or just "the helper". Children tend to rely on concerned school fi-iends to keep in touch with school work. Several parents spoke of requests for work being ignored or refused by the school. Once back at school children rarely get extra teaching, and are told to catch up as best they can. Many short-stay child-patients catch up quickly. But schools do very little to ease the anxiety about falling behind expressed by many of the children interviewed.
A．hospital teaching across the country is similarB．each hospital has at least one part-time teacherC．all hospitals surveyed offer education to childrenD．only one-fourth of the hospitals have full-time teachers
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铁细菌一般能生活在含氧少但溶有较多铁质和二氧化碳的水中。（）
A . 正确
B . 错误
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在选购面料时，除了考虑花色、款式和价格外，更要看面料的性能特点是不是与（）相吻合。
A.购买说明
B.家庭的使用需要
C.使用季节
D.着装者的特点
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施工图预算的编制方法有定额单价法和工料单价法。
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乳化剂类型改变造成乳剂酸败的原因是______。
A.乳滴的电荷减少
B.分散相与连续相存在密度差
C.微生物及光、热、空气等的作用
D.乳化剂失去乳化作用
E.乳化剂性质改变
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制定工作规范的标准是（）。
A.最优标准
B.改进标准
C.效益优先标准
D.满意标准
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在生产过程中，用来归集生产费用、计算产品生产成本的账户有（）
A.“制造费用”账户
B.“管理费用”账户
C.“生产成本”账户
D.“应付福利费”账户
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及早进行初饮对雏鸡的良好作用有（）
A.促进肠道蠕动
B.促进卵黄的吸收
C.促进胎粪排出
D.增进食欲
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完全竞争厂商短期产量决定的均衡条件是( )。
当某项医疗服务需要低，卫生资源充分，卫生服务利用率低时，说明（）。
A. 卫生资源投入过度B. 大部分人群过度利用卫生服务C. 卫生资源投入不足D. 卫生资源利用充分E. 卫生资源不能充分满足人群需要
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