| We sometimes think humans are uniquely
vulnerable to anxiety, but stress seems to affect the immune defenses of lower
animals too. In one experiment, for example, behavioral immunologist Mark
Laudenslager, at the University of Denver, gave mild electric shocks to 24 rats.
Half the animals could switch off the current by turning a wheel in their
enclosure, while the other half could not. The rats in the two groups were
paired so that each time one rat turned the wheel it protected both itself and
its helpless partner from the shock. Laudenslager found that the immune response
was depressed below normal in the helpless rats but not in those that could turn
off the electricity. What he has demonstrated, he believes, is that lack of
control over an event, not the experience itself, is what weakens the immune
system. Other A. was strengthened B. was not affected C. was altered D. was weakened [判断题]起重机械整体倾覆属于一般事故A类。
A.正确 B.错误 [单项选择]校对的一般操作模式中没有（）。
A. 连校模式 B. 选校模式 C. 分校模式 D. 人机结合校对模式 [单选题]冠状动脉粥样硬化性心脏病最重要的危险因素是
A.高血压 B.高脂血症 C.吸烟 D.糖尿病 E.性别、年龄 [单选题]运行图确定的或根据调度命令附挂于列车,担当辅助牵引的机车是( )。
A..附挂机车 B..本务机车 C..重联机车 [判断题]调车手信号的指挥机车向显示人反方向稍行移动的信号显示方式，昼间——拢起的红色信号旗直立平举，再用展开的绿色信号旗上下小动；夜间——绿色灯光上下小动。
A.正确 B.错误 [单选题]加强对抓基层工作的组织领导，要坚持( )统一领导，牢牢把握基层建设正确方向。
A.基层 B.党委 C.全局 D.上级 [判断题]发动机的分类按进气方式可分为吸入和增压
A.正确 B.错误 [单项选择]在 OSI参考模型中，（ ）数据交换单元称为数据分组（Packet）。
A. 传输层 B. 网络层 C. 数据链路层 D. 物理层 [单选题] 患者,女性,55岁。特殊职业,在生产有机磷农药工作中违反操作规定,出现有机磷中毒症状,头晕、头痛、乏力、支气管分泌物增多、呼吸困难,逐渐出现躁不安、谵妄、抽搐及昏迷。诊断有机磷农药中毒的主要指标是()
A.典型症状 B.呕吐物 C.瞳孔缩小 D.意识障碍 E.全血胆碱酯酶测定 [单项选择]某进口设备的到岸价是100万美元，外汇牌价：1美元＝8.28元人民币，国外运费率6%，国外运输保险费率2.66%，进口关税率22%，进口环节增值税率17%，外贸手续费率1.5%，银行财务费率4‰，则外贸手续费为( )万元。
A. 17.73 B. 15.15 C. 12.42 D. 11.69 [判断题]回购交易申报无数量限制。( )
[单选题]编制零件机械加工工艺规程、生产计划和成本核算最基本的单元是()
A.工步 B.工位 C.工序 D.走刀 [判断题] 转向架抗侧滚扭杆可以减少车体在直道行驶及通过道岔时的动态倾摆动作。（ ）
A.正确 B.错误 [单选题]
拆除梁、板模板应遵守下列规定: A. 应先拆梁侧模,再拆板底模,最后拆除梁底模,并应分段分片进行 B. 应先拆梁侧模,再拆梁底模,最后拆除板底模,并应分段分片进行 C. 应先拆板底模,再拆梁侧模,最后拆除板底模,并应分段分片进行 D. 应先拆梁侧模,再拆梁底模,最后拆除板底模,可以不分段分片进行 我来回答: 提交
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