未知题型 Although many factors affect human health during periods in space, weightlessness is the dominant and single most important onE.The direct and indirect effects of weightlessness lead to a series of related responses. Ultimately, the whole body, from bones to brain, kidneys to bowels, reacts.When space travelers grasp the wall of their spacecraft and jerk their bodies back and forth, they say it feels as though they are stationary and the spacecraft is moving. The reason is based in our reliance on gravity to perceive our surroundings.The continuous and universal nature of gravity removes it from our daily notice, but our bodies never forget. Whether we realize it or not, we have evolved a large number of silent, automatic reactions to cope with the constant stress of living in a downward-pulling worlD.Only when we decrease or increase the effective force of gravity on our bodies do our minds perceive it.Our senses provide accurate information about the location of our center of mass and the relative positions of our body parts. Our brains integrate signals from our eyes and ears with other information from the organs in our inner ear, from our muscles and joints, and from our senses of touch and pressurE.The apparatus of the inner ear is partitioned into two distinct components: circular, fluid-filled tubes that sense the angle of the head, and two bags filled with calcium crystals embedded in a thick fluid, which respond to linear movement. The movement of the calcium crystals sends a signal to the brain to tell us the direction of gravity. This is not the only cue the brain receives. Nerves in the muscles, joints, and skin—particularly the slain on the bottom of the feet—respond to the weight of limb segments and other body parts.Removing gravity transforms these signals. The inner ear no longer perceives a downward tendency when the head moves. The limbs no longer have weight, so muscles are no longer required to contract and relax in the usual way to maintain posture and bring about movement. Nerves that respond to touch and pressure in the feet and ankles no longer signal the direction of down. These and other changes contribute to orientation illusions, such as a feeling that the body or the spacecraft spontaneously changes direction. In 1961 a Russian astronaut reported vivid sensations of being upside down; one space shuttle specialist in astronomy said, 'When the main engines cut off, I immediately felt as though we had inverted 180 degrees.' Such illusions can recur even after some time in spacE.From the first two paragraphs we learn that weightlessness is caused by ______.A.many factorsB.the dominant and single movementC.jerking the bodies back and forthD.losing the dependence of gravity

未知题型 Whether we realize it or not(ParA.3), 'it' refers ______.A.weightlessnessB.the continuous and universal nature of gravityC.the fact that our bodies never forgetD.the previous statements

未知题型 齐某在抢劫时被蔡某等人当场抓获。公安机关讯问时，齐某对抢劫行为供认不讳，并指认参与抓获他的蔡某曾强奸过妇女。对齐某的抢劫案经一审判决后，检察院以量刑过轻为由提出了抗诉。在二审过程中，齐某又供认曾有盗窃行为。二审法院调查后证实齐某供认的盗窃属实，并构成盗窃罪。二审法院据此直接判处齐某抢劫罪和盗窃罪两罪并罚。因齐某的指认，公安机关对蔡某强奸案进行侦查。受害妇女艾某证实曾遭强奸，所描述的作案人体貌特征与蔡某相似，但闲事隔一年，经辨认却又不能肯定是蔡某。讯问蔡某时，蔡某不承认。后因侦查人员逼供，蔡某被迫承认，但所供述的内容与艾某所述作案过程在细节上多有不符。本案虽无其他证据，但检察院仍决定提起公诉。法院审理期间，正在外地服刑的齐某承认，强奸艾某的是他自己。齐某所交代的强奸犯罪过程与艾某所述细节相符，经查证，齐某的这一供述属实，法院因此判决蔡某无罪。根据以上事例，请回答以下问题。二审法院在齐某交代另有盗窃行为并查证属实时应如何处理?D.应当将本案发回原审法院重新审判

单项选择题 手术时寻找阑尾的标志是[_] A、阑尾较细 ； B、盲肠末端； C、结肠袋； D、3条结肠带汇集处； E、回肠的末端；

单项选择题 项目启动阶段常见的问题不包括（ ） A、需求沟通不够 B、成本核算偏差过大 C、过于乐观地分析项目的可行性 D、项目组成员选择不合理

单项选择题 Ra能客观全面地反映表面微观几何形状特征，Ra值越大，表面越粗糙。 A、正确 B、错误

未知题型 男，40岁。因剧烈腹痛2小时，急诊入院。人院时，心电图显示心房纤颤。查体，腹部平坦，较软，直肠指诊无黏液血便。下列对于确诊最有意义的检查是E.钡剂灌肠造影

未知题型 11 1．女，22岁。颈前肿物3个月。查体：右叶甲状腺可触及一质硬结节，直径2cm。同侧颈淋巴结可及2个，质中，活动。B型超声：甲状腺右叶一低回声实性团块。为明确肿物良恶性，下列各项检查，首先应选择A.同位素扫描B.血清降钙素测定C.针吸细胞学检查D.颈部软组织像E.右侧颈淋巴结活检

单项选择题 灵敏度可以用于评价原子吸收分光光度法。 A、正确 B、错误

未知题型 女，25岁。右肾结核行右肾切除，抗结核治疗半年多，尿痛缓解，但尿频加重，每晚7～8次，静脉尿路造影见左肾显影尚好，仅伴轻度肾积水及膀胱挛缩，尿常规白细胞0～2／HP，现治疗应选择E.膀胱造瘘术