Standing on the rim of the Grand
Canyon, gazing across this giant wound in the Earth’s surface, a visitor might
assume that the canyon had been caused by some ancient convulsion. In fact the events that produced the canyon, far from being sudden and cataclysmic, simply add up to the slow and orderly process of erosion. Many millions of years ago the Colorado Plateau in the Grand Canyon area contained 10, 000 more feet of rock than it does today and was relatively level. The additional material consisted of some 14-layered formations of rock. In the Grand Canyon region these layers were largely worn away over the course of millions of years. Approximately 65 million years ago the plateau’s flat surface in the Grand Canyon area bulged upward from internal pressure; geologists refer to this bulging action as upwarping; it was followed by a general A. Its contours are constantly changing. B. It contains approximately 14 million tons of rock. C. Its eruptions have increased in recent years. D. It is being eroded by toxic waste and pollutants. [单选题] 2021 年 1 月 11 日,总书记在省部级主要领导干部学习贯彻党的十九届五中全会精神专题研讨班开班式上发表重要讲话强调,构建新发展格局的关键在于
的畅通无阻。( ) A.交通网络 B.产业链条 C.生产循环 D.经济循环 [单项选择]脑脊液产生的主要部位()
A. 第三脑室脉络丛 B. 第四脑室脉络丛 C. 侧脑室脉络丛 D. 蛛网膜下腔 E. 蛛网膜颗粒 [单项选择]IDG滑油由什么进行冷却?()
A. 燃油 B. 低压压气机(风扇) C. 高压压气机 D. 发动机滑油 [单项选择]心跳呼吸复苏后,最容易出现的继发性病理改变是()
A. 心肌缺氧性损害 B. 肺水肿 C. 脑缺氧性损害 D. 肝小叶中心坏死 E. 肾小管坏死 [判断题]在党组织讨论决定对党员的党纪处分或作出鉴定时,本人有权参加和进行申辩,其他党员不能为他作证和辩护。( )
A.正确 B.错误 [单选题]杰出的科学家,从不认为自己是最聪明的;相反他们都很谦虚。这也印证了伽利略的一句名言:“知识越浅薄的人,愈欲( );相反,学识丰富倒使人在判断某些新事物时变得甚为( )。”填入括号部分最恰当的一项是:
A.夸夸其谈 优柔寡断 B.矜功自伐 犹豫不决 C.目中无人 畏首畏尾 D.异想天开 瞻前顾后 [单选题].研究数据表明,恩博克治疗湿疹的不良反应发⽣率为?
A. 4.42% B. 0.42% C. 7.82% D. 0.78% [判断题]划规在钳工划线工作中可以划圆和圆弧.等分线.等分角度以及量取尺寸等,是用来确定轴及孔的中心位置.划平行线的基本工具,分为普通划规.扇形划规和长划规。( )
A.正确 B.错误 [单选题] 离心泵切换时,原运转泵停运时 ( )。
A.应先停电源再关闭出口阀 B.应先停电源再关闭入口阀 C.应先关闭出口阀门再停电源 D.应先关闭入口阀门再停电源 [单项选择]患者,男,59岁,诊断为心绞痛5年,胸痛发作时经休息或含服硝酸甘油5分钟内可以缓解,患者心绞痛长期预防用药不包括()。
A. β受体阻滞剂 B. 异山梨酯(消心痛) C. 硝苯地平缓释片 D. 小剂量阿司匹林 E. 呋塞米 [单项选择]以下关于ATM网络的叙述,不合适的是______。
A. ATM网络是宽带化的传输网络,可提供各种宽带化的业务服务 B. ATM网络有高速的数据传输能力,可提供良好的服务质量QoS C. ATM网络的吞吐量与传统网络差不多 D. ATM可动态地分配带宽,适合传输突发性数据 [判断题]我国公安机关的宗旨是打击敌人,服务人民。()
[单项选择]下列哪项不是肺动脉高压的病因
A. 慢性缺氧 B. 肺血管阻力增加 C. 肺小动脉痉挛 D. 血粘度增加 E. 左心功能不全 我来回答: 提交
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