Astronaut Jim Voss has enjoyed many memorable moments in his career, including three space flights and one space walk. But he recalls with special fondness a decidedly earthbound experience in the summer of 1980, when he participated in the NASA-AS-EE Summer Faculty Fellowship Program. Voss, then a science teacher at West Point, was assigned to the Marshall Space Flight Center’s propulsion lab in Alabama to analyze why a hydraulic fuel pump seal on the space shuttle was working so well when previous seals had failed. It was a seemingly tiny problem among the vast complexities of running the space program. Yet it was important to NASA because any crack in the seals could have led to destructive results for the astronauts who relied on them.
"I worked a bit with NASA engineers," says Voss, "but I did it mostly by analysis. I used a handheld calculator, not a computer, to do a thermodynamic analysis. "At the end of the summer, he, like the other NAS
A. Because previous seals all failed.
B. Because it was very complex in running the space program.
C. Because great care has to be taken of the hydraulic fuel pump sealing.
D. Because any crack in the seals would cause disastrous results for the astronauts.
Task 1
Directions: After rending the following passage, you will find 5 questions or unfinished statements, numbered 36 to 40. For each question or statement there are 4 choices marked A, B, C and D. You should. make the correct choice and mark the corresponding letter on the Answer Sheet with a single line through the center.
To the professional linguist, there is no superiority of any language. Therefore, it is well-accepted in the field of linguistics that there exist no higher or lower grades among languages. People once thought of the languages of backward groups as undeveloped forms of speech, consisting largely of rough and simple sounds. It is possible that language in general began as a series of simple sounds. But it is a fact established by the study of "backward" languages that no spoken tongue A. Being complete. B. Being better. C. Being large. D. Being tiny. [单选题]医疗卫生机构和医疗废物集中处置单位,应当对医疗废物进行登记,登记内 容应当包括医疗废物的来源、种类、重量或者数量、交接时间、处置方法、最终去向以及经 办人签名等项目。登记资料至少保存( )年
A.3 B.4 C.5 D.6 [单项选择]地球温度的保持得益于薄薄的大气层,当太阳光射向地球时,大气层吸收其中大量的红外线以及波长较短的紫外线,它们都会使气温升高,从而在向外太空辐射出一部分红外线时也向地面发出红外线,而未被大气吸收的其他太阳光射向地面时,引起地面温度上升,地表温度上升时也会向大气散发出红外线,大气吸收后,一部分通过大气逆辐射返还给地球,一部分消失至太空。这样地面温度、大气温度就能够保持在一个相对恒定的数值范围之内,月球就因为缺乏这样的大气层而骤冷骤热。这种“温室效应”在金星中同样存在,只是因为它的云层过厚,且二氧化碳是主要成分,而二氧化碳是气体中主要吸收红外线的类型,这使金星的温度要比地球高许多倍。
根据上文,以下选项可以推断为正确的是()。 A. 大气热量的来源包括:太阳辐射、地面辐射以及大气逆辐射。这些都使大气韵温度能够升高 B. 如果大气辐射增加,大气的温度会因此而升高,地面的温度也会因此而上升 C. 大气辐射和大气逆辐射本质上一样,只是由于热量来源不同,辐射后的红外线走向不一样而已 D. 红外线的吸收是引起温度上升的主要原因,月球上因为缺乏像金星一样富含二氧化碳的大气层,所以即使在最高温度时,也没有金星的温度高 [单选题]呈披针形或长卵形,略卷曲,叶端短尖或微突,叶基不对称,两面均有细短毛茸的是
A.尖叶番泻 B.狭叶番泻 C.大青叶 D.蓼大青叶 E.枇杷叶 [单项选择]我们知道生产过程中一种要素的收益保持不变发生在()
A. 在其它要素保持不变时,多使用这种要素,产量增加 B. 在其它要素相应增加时,多使用这种要素,这种要素的边际产量不变 C. 在其它要素保持不变时,多使用这种要素,这种要素的平均产量等幅度增加 D. 在其它要素保持不变时,多使用这种要素,这种要素的边际产量不变 [单项选择]Why does the author say it is impossible to make a mistake in the second paragraph
[单项选择]设备安装精度控制中,采用修配法对补偿件进行补充加工的目的是()。
A. 解决设计存在的问题 B. 抵消过大的安装积累误差 C. 修补制造的加工缺陷 D. 补偿零部件的装配偏差 [单项选择]男性,65岁。临床诊断食管中段癌,拟限期在全身麻醉下施行食管癌根治术。患者吸烟史37年。罹患慢性支气管炎15年。动脉血气检查结果:pH7.38,PaCO266.8mmHg,PaO250mmHg,患者存在的酸碱代谢失调是()。
A. 代谢性酸中毒 B. 代谢性碱中毒 C. 高碳酸血症 D. 高碳酸血症伴代谢性酸中毒 E. 高碳酸血症伴代谢性碱中毒 [判断题]空气呼吸器使用结束后要关闭气瓶阀手轮,不能泄掉连接管路内余压。
A.正确 B.错误 [单选题]根据劳动合同法律制度的规定,下列关于劳动合同履行的表述中,不正确的是( )。
A.用人单位拖欠劳动报酬的,劳动者可以依法向人民法院申请支付令 B.用人单位发生合并或者分立等情况,原劳动合同不再继续履行 C.劳动者拒绝用人单位管理人员违章指挥、强令冒险作业的,不视为违反劳动合同 D.用人单位变更名称的,不影响劳动合同的履行 [判断题] [判断]货用升降机吊笼与升降机导轨架的颜色应统一。
A.正确 B.错误 [填空题] 大修地段与非大修地段的连接顺坡,应设在大修地段以外,其顺坡率允许速度不大于120 km/h线路不应大于( )。
[单选题]建筑意外伤害保险是以( )作为投保单位的。(《建设工程造价管理》2019年版)
A.工程项目 B. 施工单位 C.分部分项工程 D. 施工班组 [判断题]电气设备着火,应立即隔绝着火设备,然后进行灭火。( )
A.正确 B.错误 [单选题]10岁男孩,发热,关节肿痛,皮肤出现环行红斑,心率快,出现奔马律,血沉增快,经治疗上述症状、体征消失后,需预防的方法是()
A.避免关节损伤 B.忌海鲜 C.减少体育运动 D.长效青霉素肌注 E.激素吸入维持 [判断题]放射性矿山的井下,可以饮水和就餐。
A.正确 B.错误 [名词解释]湿地退化
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