Space is a dangerous place, not only
because of meteors (流星) but also because of rays from the sun and other stars.
The atmosphere again acts as our protective blanket on earth. Light gets
through, and this is essential for plants to make the food which we eat. Heat,
too, makes our environment endurable. Various kinds of rays come through the air
from outer space, but enormous quantities of radiation (辐射) from the sun are
screened off. As soon as men leave the atmosphere they are exposed to this
radiation but their spacesuits or the walls of their spacecraft, if they are
inside, do prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 rem without being damaged A. exposure to even tiny amounts of radiation is fatal B. radiation is avoidable in space exploration C. astronauts in spacesuit needn’t worry about radiation damage D. the effect of exposure to radiation is slow in coming [判断题]手枪的性能检查其中要检查击针和击锤是否正常
运动,注意防止击针锈死,并检查击针是否断裂。 A.正确 B.错误 [单项选择]随机变量X服从均匀分布(6,10),则随机变量X的均值和方差分别是( )。
A. 1;5.33 B. 1;21.33 C. 2;5.33 D. 2;21.33 [单选题]【单选题】在华为 BCmanager ebackup中,快照对比技术相比于CBT技术有什么优
势? A.获取数据变更的时间更长 B.对生产端占用的空间较小 C.生产端可以保存快照,对数据的保护更好 D.支持对使用华为分布式存储的拟机进行备份 [单选题](2018年版)《贵州电网有限责任公司现场作业违章管理办法》规定,公司安监部负责组织制定( )违章管理制度、标准,地市级单位安监部门负责制定( )类违章管理实施细则、业务指导书等标准,部门及分县局负责执行。
A.AB类,CD类 B. ABC类,D类 C.A类,BCD类 D.A类,BC类 [单项选择]女性,58岁,10天前曾划破右下肢皮肤。3天来高热,伴皮肤淤点。查体:血压80/50mmHg(10.7/6.7kPa)。诊断为败血症、感染中毒性休克,经积极治疗后仍高热不退,且出现气急,未吸氧时PaO245mmHg。X线示肺纹理增多、模糊。该患者进行机械通气时,哪些描述不正确()
A. 如应用PEEP应从低水平开始,渐增加至合适水平,避免肺泡及小气道陷闭 B. 较低潮气量,限制气道峰压<40cmH2O C. 注意补充血容量以代偿回心血量不足 D. 吸氧浓度不宜超过50% E. 尽量降低PEEP水平,吸氧浓度可不限制 [单选题]开展交通道路火灾扑救或应急救援时,救援车辆应跨路斜停(车尾靠近来车方向)在事故车辆后方,停靠位置应距离事故点不少于()米。
A.15 B.25 C.30 D.50 [单选题]地铁6号线设有( ) 个一级联锁设备集中站。
A.2 B.3 C.4 D.1 [判断题]起重机在重物提升回转时,启动和停车一定要平稳。
A.正确 B.错误 [单项选择]农业推广系统中决定农业推广工作成效的主体能动因素是()
A. 农业推广计划 B. 推广人员 C. 农业推广项目 D. 物质和资金 [判断题]真空脱氢与真空脱氮的效率是—样的。( )
A.正确 B.错误 [填空题]加工硬化的后果是使金属的塑性降低,强度和硬度()。
[多项选择]海关批准货物保税的原则是( )。
A. 可以监管 B. 复运出境 C. 合法经营 D. 企业必须是B类企业 [单项选择]集中式空气调节器的组成中不包括()。
A. 风机 B. 布风器 C. 加湿器 D. 加热器 [判断题]没有网络写手,网络原创文学就不会产生。
[单项选择]There is no doubt that the relationship ’between trade and development is one of the central policy issue we face today. We live in a world where 50% of humanity lives on less than $ 2 a day . We live in a world (21) by massive inequality between nations. It is estimated that about 2 billion extra souls will share our crowded planet within the next 30 years. However, we face a world of incredible (22) and challenges. Trade and trade policy must play their roles as a part of a wider development scenario. And WTO’s efforts to push forward this (23) must be strengthened and coordinated at all levels, national, regional, and (24) .
1980s has witnessed the petroleum impact, debts crisis, prices slump, economic (25) in industrial countries and the climax of new policy for trade protection as well. However, in recent years, foreign trade in those developing countries has been back to the right (26) of remarkable increase, an indispensable force A. are B. replace C. locally D. international [判断题]忽思慧是蒙古族人,元朝廷祐年间任饮膳太医,掌管宫廷饮膳事宜。
A.正确 B.错误 [单项选择]病人出现弥散性血管内凝血的早期征兆是( )。
A. 血液不易抽出 B. 易出鼻血 C. 皮肤出现出血点 D. 便血 E. 咯血 [单选题]严格物资合同变更管理,物资供货范围发生变化应办理技术变更和商务变更手续后,组织签订()。
A.补充协议 B.技术协议 C.变更协议 D.合同协议 [单选题]( )也是实行定修不可分割的一个组成部分。
A.月修 B.年修 C.日修 D.检修 [单项选择]苯作业工人的膳食调配,除外
A. 增加优质蛋白质的摄入 B. 提高脂肪摄入量 C. 充足的维生素C、维生素B6、B12 D. 适当增加铁的摄入 E. 适当提高碳水化合物的摄入 我来回答: 提交
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