[多选题]产生回火的原因有哪些?( )-我要搜题网

Mountain climbing, or ascending mountains, is popular worldwide, wherever hills rise high enough to provide a challenge. The activity’s rewards include the physical exercise it provides, the satisfaction of overcoming difficulties by working with others, the thrill of reaching a summit, and the unobstructed views from a mountaintop. Exploration and research are other reasons that people climb mountains. Since ancient times, people have viewed mountain peaks as towering objects of myth, spiritual inspiration, and romantic beauty. Early peoples made ascents only to hunt game, to rescue lost or strayed animals, or to gain a military advantage over an enemy. Eventually, the unknown and inaccessible peaks ceased to be feared and avoided, and the conquest of the major mountain peaks and ranges of the world began. Mountaineering as a sport was born on August 8,1786. Since that ascent, mountain climbing has evolved into
A. ongoing
B. changing
C. underdeveloped
D. unbalanced

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[单选题]“生命线”既是“紧箍咒”也是“高压线”,是公安执法的重要价值取向。下列选项中,符合公安工作的“生命线”要求的是:
A.坚持理性和平行动
B.严守听党指挥要求
C.严格规范公正文明执法
D.牢固树立纪律严明要求

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[单项选择]甲、乙两车同时从两地相对开出，甲车每小时行50公里，乙车每小时行40公里，两车开2小时后还相距30公里，问两地间的距离有多少里( )。
A. 210
B. 420
C. 310
D. 520

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[单项选择]关于钙通道，下列哪一种说法是错误的
A. 不引起水、钠潴留
B. 可引起反射性心率加快
C. 降低外周血管阻力
D. 可引起外周性水肿
E. 不能逆转高血压所致的心室肥厚

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[单选题]旅客携带品超重应补收上车站至下车站的（）类包裹运费。
A.一
B.二
C.三
D.四

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[单选题]电梯三角钥匙应由经过专门培训、有资格的( )保管使用。
A.本单位安全员
B.特种设备安全管理员
C.电梯驾驶员
D.本单位维修工

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[判断题]男职工配偶没工作也能报销引流产和配偶计划生育的费用。这种说法正确吗？
A.正确
B.错误

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[多选题]我国宪法规定的公民的政治自由有:()。
A.A选举和被选举权
B.B言论出版集会结社自由
C.C游行示威自由
D.D宗教信仰自由

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[单项选择]下列各项，与特发性血小板减少性紫癜发病关系最密切的是( )
A. 心、肝、脾、肾
B. 肺、肝、脾、肾
C. 心、肝、脾、肺
D. 心、肺、脾、肾
E. 心、肝、肺、肾

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[简答题]

Last time we started looking at the question of management and wondering what the term actually meant. Then we took a brief look at the concept of scientific management. You remember, we decided it was useful but not enough on its own. So today we’re going to look at another aspect—behavioral management. You may not really have come across this word "behavioral" before, though I’m sure you are familiar with the word "behavior". Behavioral simply means having to do with behavior. And that is our starting point for today : We are going to start by realizing that the activity of any organization is human activity, designed to achieve human goals. So we are really talking about human behavior.Any business concern does two things. First, it provides either goods or services that the customer needs. That is, it either makes things or does things for other people in exchange for money. Second, it provides people with work—and most of us have t

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[判断题]根据新奥能源工程数字化系统应用管理规则要求：企业必须将监理单位监理人员含总监的证件和身份证号码等信息录入系统，动态更新管理。
A.正确
B.错误

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[简答题] 采用自动站间闭塞法行车时,按下站台紧急停车按钮后将关闭。(1.0分)

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[多选题]产生回火的原因有哪些?( )
A.烧嘴的热负荷太大,混合可燃气体的喷出速度过高;
B.烧嘴混合管内壁不光洁,混合可燃气体产生较大的涡流;
C.混合管内有火源存在;
D.空气的预热温度过高。

热门试题:

[多选题]产生回火的原因有哪些?( )A.烧嘴的热负荷太大,混合可燃气体的喷出速度过高;B.烧嘴混合管内壁不光洁,混合可燃气体产生较大的涡流;C.混合管内有火源存在;D.空气的预热温度过高。

热门试题:

[多选题]产生回火的原因有哪些?( )
A.烧嘴的热负荷太大,混合可燃气体的喷出速度过高;
B.烧嘴混合管内壁不光洁,混合可燃气体产生较大的涡流;
C.混合管内有火源存在;
D.空气的预热温度过高。