更多“加热炉管常用的清焦方法有空气和蒸汽烧焦法以及机械清焦法两种。”相关的问题
A . 肉桂B . 杜仲C . 黄柏D . 厚朴E . 白鲜皮
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世界上国家和地区分布最多的洲是（）。
A.亚洲
B.非洲
C.大洋洲
D.欧洲
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Given the following scripts， both found in /usr/local/bin， what would the output be when executing /usr/local/bin/script1？（）
A.dog cat B.dog fish C.mouse cat D.mouse fish
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船舶设置结构防火目的是阻隔燃烧时的热量、火焰、烟传播.
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关于船舶应变部署表的内容,下列说法不正确的是_____。
A. 有关应变的警报信号的规定 B. 职务与编号、姓名、艇号的对照一缆表 C. 航行中驾驶台、机舱、电台固定人员及其任务 D. 不应指明哪些船上高级般员负责保证维护教生和消防设备
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以爱国主义为核心的民族精神是（ ）。A．中华民族生命机体中不可分割的重要成分 B．中华民
以爱国主义为核心的民族精神是（ ）。 A．中华民族生命机体中不可分割的重要成分 B．中华民族生生不息、发展壮大的强大精神动力 C．社会主义核心价值体系的重要内容 D．社会主义公民道德建设的重点
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对水轮机调节系统危害最大的水锤是（）。
A.直接水锤； B.间接水锤； C.第一相水锤； D.末相水锤。
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Naturally, in a group of animals as diverse as the snakes, and with so many varied enemies, there are numerous defensive reactions and devices. There is, however, one general pattern of behavior. In the presence of suspected enemy the first reaction is to try to escape observation; if this fails, the next resort is the flight to some inaccessible retreat, but if this is not possible, or is circumvented, various kinds of intimidatory gestures and warning devices are brought into play; in the last resort the snake attacks. This pattern varies with the circumstances; some stages may be omitted or combined unpredictably whilst; some notoriously irascible species may dispense with all the preliminaries and attack almost at once, though seldom or never without some provocation. Amongst the factors that increase aggressiveness are hunger, the mating season and surprise, with the last mentioned the commonest; when hunting for food or for mate, activity and the aggressive instinct are both at their peak. Owing to their poor sense of heating snakes are very liable to be, quite literally, caught napping and a similar situation arises during their periods of temporary blindness just before sloughing (蜕皮) begins. By far the greatest number of snake-bit accidents result from the unwitting disturbance of resting snakes, and this hazard is much increased with species that are well disguised and whose natural instinct is to trust to this concealment as their principal defense. As well as differences in aggressiveness between individuals of the same species according to the circumstances and conditions, there are also notable differences between species, even closely allied species; and the reports of those who have been attacked may understandably be lacking in objectivity. So it is impossible to forecast, even in outline, how any encounter will develop. The Hamadryad, for example, is usually credited with being amongst the most aggressive of snakes, and there are many accounts of unprovoked attacks, yet on one occasion fourteen men and seven dogs passed and returned within two yards from a nest and no snake was seen although the female, which guards the nest, could not have been far away.
A．avoiding any observation.B．finding a safe shelter.C．giving a warning threat.D．starting a quick attack.
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若埋设在水沟以外地点的局部接地极，可以使用钢板。（）
A . 正确
B . 错误
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在sql语言中，对于字段的模糊匹配，我们可以使用关键字（）进行限制。
A.andB.isC.likeD.case when
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属于工业产权的是（）
A.文字作品 B.音乐 C.曲艺 D.摄影作品 E.货源标记
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男，58岁。反复咳嗽、咳痰20余年，气促、心悸、下肢间断性水肿2年，病情加重伴发热1周来诊。查体：T38.5℃，呼吸急促，口唇发绀，双肺叩诊过清音，中下肺有湿啰音，心率108次/分，律整，无杂音，双下肢水肿（++）。该患者的主要治疗措施是（）。
A . 止咳、祛痰B . 控制感染、改善呼吸功能C . 解痉、平喘D . 低浓度持续吸氧E . 强心、利尿
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在用液化石油气灌装秤，每年应至少校验（）。
A.1/2次
B.1次
C.2次
D.4次
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每张餐桌上所安排的用餐人数应限在10人以内，且必须为双数。
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