[单选题]员工因个人原因辞职的，应提前（）日以书面形式提出辞职申请。-我要搜题网

[不定项选择题]共用题干第二篇

Exercise and Brain

Just as exercise strengthens the heart and lungs,bones and muscles,it may also power up the brain.A succession of scientific studies of animals implies that physical activity has a positive effect on mental functioning.
"It's clear that the brain benefits from exercise,"says brain scientist William Greenough of the University of Illinois at Urbana-Champaign.His studies with rats have demonstrated two primary effects of activity:Vigorous physical exercise provides the brain with more fuel,and skill-based ex-ercise increases the formation of connections in the brain, which, according to the proposals of some scientists,may make the brain better able to process information.
In one experiment,laboratory rats were separated into three groups.One group was exercised by running inside an automatic wheel,a second group improved their skills in a complicated obstacle course,and a third group was inactive.
"The animals that learned to go through the obstacle course exhibited a greater number of brain connections than the animals in the exercised or inactive groups,"Greenough said."In contrast, the animals that exercised inside the automatic wheel possessed a greater density of blood vessels in the brain than did either of the other two groups of animals."
Learning a new dance step may boost the brain in the same way that learning a language can, he says.And if the dance is a good physical exercise as well,the benefits multiply.Young brains may be especially able to boost brain power through exercise,suggested another of Greenough's experiments that showed the most significant changes in the brain occurred among rats that had been exercised when very young.And while animals aren't people,he says it is logical to make the inference that an effect found in rats may also apply to humans.
Human studies have focused primarily on older adults and suggest that regular exercise can improve the speed with which the brain processes information.Measurements made by Arthur Kramer at the University of Illinois demonstrated that inactive adults,aged 63 to 82,could hit buttons faster in response to a tone after they went through a 10-week water exercise course.A corresponding control group that didn't exercise showed no improvement. According to the passage what is not the advantage of physical exercises?
A.do good to our mental health.
B.strengthen our hearts and lungs.
C.strengthen our bones and muscles.
D.help us lose weight.

查看答案

[多项选择]货币市场是指以期限在一年以内的金融工具为媒介，进行短期资金融通的市场，包括（）。
A. 同业拆借市场
B. 票据市场
C. 大额定期存单市场
D. 股票市场

查看答案

[单选题]CRH1A动车组外接电源连接后，首先给外部交流供电接触器提供( )V电压，通过该接触器联通外接电源与三相交流总线。( )
A.DC24
B.DC110
C.AC220
D.AC400

查看答案

[判断题]《关于发布电力工程计价依据营业税改征增值税估价表的通知》定额【2016】 45 号文件规定,可研估算和初设概算阶段,采用一般计税方法计税的工程,将甲供工艺设备的含税价格计入设备购置费。
A.正确
B.错误

查看答案

[判断题]调车作业计划是保证实现阶段计划的调车作业具体行动计划。由调车领导人负责编制。
A.正确
B.错误

查看答案

[简答题]‡1124164917

查看答案

[单项选择]下列关于HIV急性感染期的描述，错误的是（）
A. 临床表现较为典型，易识别
B. 可以出现发热、全身不适、淋巴结肿大等表现
C. 通常为HIV复制开始阶段
D. 血中可以检测出p24
E. CD4⁺T细胞降低明显

查看答案

[单项选择]女性，45岁。因SLE口服糖皮质激素近2年，发热2周伴咳嗽，痰中带血丝，查肺部无异常体征，胸片右上肺野多发片状结节影伴空洞，血沉40mm／h，PPD5IU（-）。对该患者PPD实验结果的解释错误的是（）
A. 强阳性可支持结核诊断
B. 阴性可排除结核
C. 阳性表示结核感染
D. 弱阳性提示卡介苗交叉反应
E. 免疫抑制者诊断价值受影响

查看答案

[单选题]装设于配电变压器低压母线处的反孤岛装置与低压总开关、母线联络开关间应具备操作（）功能。
A. 简单
B. 方便
C. 闭锁
D. 可靠

查看答案

[判断题]二次回路现场检测宜使用配电第二种工作票。
A.正确
B.错误

查看答案

[单选题]舒张期震颤发生于
A.胸骨右缘第2肋间
B.胸骨左缘第2肋间
C.胸骨左缘第3、4肋间
D.心尖部
E.胸骨左缘第2肋间及其附近

查看答案

[单项选择]编制施工成本计划时，施工成本可按成本构成分解为人工费、材料费、施工机械使用费（　）。
A. 措施费和间接费
B. 直接费和间接费
C. 规费和企业管理费
D. 间接费、利润和税金

查看答案

[填空题]世界各国的广播电台的节目由五大块内容构成（）

查看答案

[简答题]地装置的敷设应符合GB50194《建设工程施工现场供用电安全规范》的规定，人工垂直接地体宜采用热浸镀锌圆钢、角钢、钢管，长度宜为_________m。