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题目：
单选题
AⅡ型超敏反应的辅助诊断
B预防药物或疫苗过敏
C传染病的辅助诊断
D寻找变应原
E评价机体细胞免疫功能状态
答案：
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Every country has traffic rules and signs, but are they the same? In most countries, there are street and road signs with 21________ about location,directions,dangers,cautions, and rules of the road. These 22 _________ tell drivers and pedestrians what to do and what not to do,including speed and parking 23 ________,places to stop,when to make turns,and other 24________.However, specific local traffic laws and practices usually differ around the world. For instance, in Japan, Indonesia, South Africa, the United Kingdom, and other countries ,steering 25________are on the right side of vehicles ,and cars and trucks drive on the left side of the road. In other 26 _________,such as the United States,Saudi Arabia,Italy, and Mexico,steering wheels are on the left side of vehicles ,and cars and trucks 27________on the right side of the road. An illustration of a local 28________law is the regulations for pedestrian and school 29 ________ in some Mexican cities:drivers rarely respect the rules,so for safety, people cross streets only at stop lights, on roads with little traffic, or on pedestrian-only 30 _________ across wide avenues.
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下列不属于冬期施工准备措施的是（）。
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在国家人口计生委制定的县级生殖健康服务标准中不包括（）。
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用浮标法测流，断面流量等于断面徐流量再乘以（）。
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体现医生业务水平高低的是（）。
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与汞中毒密切相关的是（）
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裂缝按其产生的部位不同，又有（）不同的分类等。
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塔顶硫化氢线结晶如何处理？
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结合《上枢密韩太尉书》一文和自己的实际，简单谈谈对“气”的理解。
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在企业安全文化建设中，员工应充分理解和接受企业的安全承诺，并结合岗位任务实践这种承诺，下列工作中，不属于一线员工实践的安全承诺是（）。