Increasingly, historians are blaming
diseases imported from the Old World for the great disparity between the native
population of America in 1492--new estimates of which jump as high as 100
million, or approximately one-sixth of the human race at that time--and the few
million full-blooded Native Americans alive at the end of the nineteenth
century. There is no doubt that chronic disease was an important factor in the
sharp decline, and it is highly probable that the greatest killer was epidemic
disease, especially as manifested in virgin-soil epidemics. Virgin-soil epidemics are those in which the populations at risk have had no previous contact with the diseases that strike them and are therefore immunologically almost defenseless. That virgin-soil epidemics were important in American history is strongly indicated by evidence that A. demonstrate the impact of modern medicine on epidemic disease. B. refute allegations of unreliability made against the historical record of colonial America. C. advocate new research into the continuing problem of epidemic disease. D. confirm the documentary evidence of epidemic disease in colonial America. [多选题](多选)再次复查时违法排放污染物行为已经改正,生态环境主管部门在之后的检查中又发现排污者符合再次实施按日连续处罚情形的,下列做法正确的是( )。
A.应当重新作出处罚决定 B.按日连续处罚的计罚周期重新起算 C.按日连续处罚次数不受限制 D.以上做法不都正确 [多选题]商业银行下列部门中,应在其职责分工和专业特长范围内为其他部门提供管理操作风险的资源和支持的有( )。
A.人力资源 B.法律/合规 C.信息科技 D.内部审计 E.战略规划 [单选题]沿每节车辆的“左”侧门扇用()连续编号
A.1-9奇数 B.2-10偶数 C.1-19奇数 D.2-20偶数 [单选题]妇女怀孕早期,胎儿生长慢,基础代谢增加不明显,一般应从孕期第几个月开始逐渐增加热能供给量
A.2个月 B.3个月 C.4个月 D.5个月 E.6个月 [多选题]点验的内容包括( )
A.执行编制的情况 B.装备和物资的数量、质量、保管、维修、保养情况 C.人员的健康和卫生状况 D.装备、物资“三分四定”落实情况和携行能力 E.个人物品 [判断题]检验员只要按标准要求进行检验就可以了,不需要做记录。
A.正确 B.错误 [简答题]食品安全法对食品安全监督管理措施是如何规定的?
[简答题]小班的小里正在沙箱旁边玩,他专著地用沙子装满自卸卡车,然后倒出沙子,将沙子堆成一座小沙丘。而小可也在他旁边玩一个玩具推土机。突然小可开着它的推土机跃过了小里的沙丘,把沙丘轧平成了一条道路。小里立刻大哭起来,并打了小可。请分析这一事件产生的可能原因。
[单项选择]红细胞膜缺陷性贫血()
A. 缺铁性贫血 B. 血红蛋白病 C. 溶血性贫血 D. 遗传性球形细胞增多症 E. 再生障碍性贫血 [单选题]滑轮轮槽底部直径磨损量达钢丝绳直径的()%应报废。
A.20 B.30 C.25 D.50 [单项选择]由组织结构确定的职务分配很明确的群体是()
A. 正式群体 B. 非正式群体 C. 命令型群体 D. 任务型群体 [填空题]CRH380B型动车组02、07车3轴(参考轴)轮径值发生变化时,需在相应牵引单元( )中进行设定
[多选题]常见的旁路负荷开关具有()等工位
A.闭合 B.断开 C.冷备用 D.检修 [多选题]依据《中国南方电网有限责任公司电力安全工作规程》(Q/CSG 510001-2015)第6.1.2.3条规定:作业前应召开现场工前会,由工作负责人(监护人)对工作班组所有人员进行安全交代,安全交代内容包括( )。
A. 作业地点及范围 B. 作业技能及方法 C. 作业环境及风险 D. 安全措施及注意事项 [多选题]办理货币存取款和外币兑换业务的金融机构收缴假币时,正确的操作是()。
A. 在持有人视线范围内当面收缴; B. 加盖“假币”章或用专用袋加封; C. 出具《假币收缴凭证》; D. 将盖章后的假币退还持有人; E. 向持有人告知其权利。 [判断题]如雨雪天气在户外操作,不用戴绝缘手套、必须穿绝缘靴或站在绝缘台上操作。
A.正确 B.错误 [多选题]公司对车辆运维管理监督检查主要有( )内容
A.执行车辆安全检查制度、定期维护保养制度、车辆“三检制度”情况 B.特种作业车辆的安全技术档案,档案内容包括车辆维修、维护和检查记录 C.大件运输、大件转场、特殊环境时履行有关规程和专门的安全技术措施 D.车辆购置的计划申报、项目储备编制、车辆采购、车辆验收及增资情况 E.车辆监控平台、车载监控终端及维护情况 [单项选择]患者,男,15岁,直面型,鼻唇角正常,面下1/3正常,颏唇沟略深。前牙Ⅱ度深覆,覆盖4mm,磨牙远中尖对尖关系,上颌拥挤4mm,下颌无拥挤,第二磨牙已完全萌出。若该患者资料显示不允许上前牙唇倾,下颌关节不允许下颌向前诱导,治疗计划可能为()
A. 不拔牙矫治 B. 拔除两个上颌第一双尖牙 C. 拔除双侧上颌第一双尖牙和下颌第一双尖牙 D. 拔除双侧上颌第一双尖牙和双侧下颌第二双尖牙 E. 拔除双侧上颌第三磨牙,推双侧上颌第一磨牙向远中 [简答题]试述胀轨跑道的防治和处理。
[单项选择]Sally Kristen Ride was born on May 26, 1951 in Los Angeles, California. At the (36) of ten, Dr. Ride began to play tennis and became an excellent tennis player. She (37) a tennis scholarship to Westlake School for (38) in Los Angeles. After her (39) , she enrolled in Swarthmore College and (40) out to become a (41) tennis player. She worked hard (42) her tennis game, but after a few months decided she would (43) tennis. She enrolled at Stanford University. Dr. Ride had always been (44) in Math and Science and eventually (45) her doctorate degree in Physics. Dr. Ride saw an (46) in the Stanford University paper about NASA (47) for people to become astronauts. She applied (48) the space program. More than 8 000 people applied and thirty-five were (49) . Dr. Ride underwent extensive training (50) an astronaut and (51) the first American woman in spa
[简答题]设计一个2位BCD码减法器。注意可以利用BCD码加法器来实现。因为减去一个二进制数,等于加上这个数的补码。只是需要注意,作为十进制的BCD码的补码获取方式与普通二进制数稍有不同。我们知道二进制数的补码是这个数的取反加1。假设有一个4位二进制数是0011,其取补实际上是用1111减去0011,再加上1。相类似,以4位二进制表达的BCD码的取补则是用9(1001)减去这个数再加上1。
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