更多“ 下列混合溶液是否具有缓冲作用？为什么？ （1）0.1mol”相关的问题
Why are subterranean buildings good for energy conservation
A．Because they use solar energy.
B．Because they don't need central heating.
C．Because the temperature there remains constant.
D．Because they don't need air-conditioning.
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欲使沉淀溶解，应设法降低有关离子的浓度，保持
{Q}_{\mathrm{i}}<{K}_{\space \text{sp}} ，沉淀
即不断溶解，直至消失。（ ）
细菌毒力主要表现在( )A．分解代谢产物B．侵袭力和毒素C．侵人机体的途径D．特殊结构E．基本结
细菌毒力主要表现在( ) A．分解代谢产物 B．侵袭力和毒素 C．侵人机体的途径 D．特殊结构 E．基本结构
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在开盘前测定粗、细骨料的含水家，并据此计算提出施工配合比。混凝土原材料计量偏差:水泥、水、外加剂、掺合料≤(）%，粗细集料≤（）%。
A. 0. 5；1
B. 1；2
C. 1；3
D. 2；5
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在生产实践中，如果进入脱硫系统溶液的水量和带出的水量相等，溶液就处于水平衡状态
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下列哪项发育指标属于形态指标（）
A.肺活量 B.心率 C.皮厚度 D.最大耗氧量 E.以上都不是
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298K时两个级数相同的反应1、2,活化能 ,如果速率常数 ,则反应的活化熵相差( )J/(mol·K)
A. 0.6 B. 10 C. 19 D. 190
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对于应当拆除的工程，建设单位应当在拆除工程施工( )日前，将有关的拆除措施资料报送建设工程所在地的县级以上的地方人民政府主管部门或者其他有关部门备案。
A．30B．15C．14D．20
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支气管肺炎易发生于______。
A.两肺上叶B.右肺中叶C.两肺尖D.左肺舌叶E.两肺下叶
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HttpURLConnection对象是通过（）创建出来的。
A.URL对象的openConnection方法
B.new
C.URL对象的connect方法
D.HttpURLConnection类的build方法
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第二萃取塔化学清洗是因为亚硝酸钠溶液或二乙基羟胺溶液可十分有效地杀死活性米花状聚合物种子。
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以下关于邻嵌体的鸠尾峡的描述，正确的是（）
以下关于邻嵌体的鸠尾峡的描述，正确的是（）
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已接待驾车旅游者为主，多建于公路干线边的旅游饭店是（）
A.观光型旅游饭店 B.度假型旅游饭店 C.长住型旅游饭店 D.汽车旅游饭店
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风机叶轮为后向型叶片，流道长，稳流区相对较长。
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Common cold is a viral infection that starts in the upper respiratory tract, sometimes spreads to the lower structures, and may contribute secondary infeeti9ns in the eyes or middle ears. The main differences between the common cold and other respiratory infections are the absence of fever and the relative mildness of the symptoms. About 200 different strains of virus are capable of producing colds. Frequently two or more different viruses can be isolated during a single episode. The cold is spread by person-to-person contact. People can carry the virus and communicate it without themselves experiencing any of the symptoms. Incubation is short—usually one to four days. The viruses start spreading from an infected person before the symptoms appear, and the spread reaches its peak during the symptomatic phase. The incidence of colds peaks during the autumn, and minor epidemics commonly Occur throughout the winter. The reason for this incidence is unknown; it may not stem mainly from stresses imposed by chilly weather but rather result from the greater amount of time spent indoors, which increases the likelihood of close contact with those persons carrying cold viruses. Pathologic changes occurring in the mucous membrane that lines the nose, the nasal sinuses, the nasoharynx, and other upper respiratory passages may include tissue swelling, congestion of blood, and oozing of fluids. During the acute phase of the disease, the respiratory secretions are. altered by increase in serum proteins. Parts of cells may ’also be found in the fluids. Tissue repair is rapid and seems complete, although a relationship might exist between colds and more serious respiratory conditions. Cold symptoms vary from person to person, but in the individual the same symptoms tend to recur in succeeding bouts of infection. Manifestations may include sneezing, headaches, fatigue, chilling, sore throat, inflammation of the nose (rhinitis), and nasal discharge. There is usually no fever. The symptoms usually last for only a few days. Tile nasal discharge is the first warning. The secretions become watery, clear, and excessive. Later, they thicken, increase in mucus and pus content, and may colour a yellow-green, with traces of blood. Coughing can be dry or produce amounts of mucus. Other, more serious diseases with similar general symptoms may be mistaken for a cold; some of these are tuberculosis, bronchitis, lung abscesses, and inflammation around the heart. Treatment is, in most instances, directed toward allaying of symptoms, coupled with rest and adequate fluid intake. Occasionally antibiotics are given to prevent secondary infections.
A．a hereditary diseaseB．generally accompanied with mild feverC．a kind of popular respiratory infectionD．caused by spending a lot of time outdoors in chilly weather
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