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[单项选择]比较有关种群、群落、生态系统的概念,属于群落层次的是()①年龄结构②生态位③空间结构④次生演替⑤基因频率⑥食物链⑦信息传递
A. ①③⑥
B. ②③④
C. ③④⑤
D. ⑤⑥⑦

热门试题:

[判断题]水在加热过程中达到饱和温度后,若继续对水加热而压力不变,蒸汽温度也升高.( )
A.正确
B.错误
[单选题]( )对油性皮肤或座疮皮肤适宜。
A.咖啡
B.巧克力、水、蔬菜汁
C.蔬菜汁、水、鲜榨果汁
D.牛奶、巧克力
[单选题]下列关于鱼道的说法错误的是(  )。
A.由进口、槽身、出口及诱鱼补水系统等几部分组成
B.水池式鱼道适用于水位差不大和鱼类活力强劲的情况
C.诱鱼补水系统利用鱼类逆水而游的习性,用水流来引诱鱼类进入鱼道
D.隔板式鱼道水流条件较好,适应水头较大
[单项选择]症见腹部冷痛,下利清谷,五更泄泻,水肿者,常为()
A. 肺胃两虚
B. 脾胃同病
C. 肝脾不和
D. 脾肾俱病
E. 肾、膀胱并病
[多项选择]下列各种情况,需要进行财产全面清查的是( )。
A. 企业股份制改制前
B. 企业合并前
C. 出纳人员调离工作前
D. 公司总经理调离工作前
[多选题]患者,男,52岁。因胸痛、痰中带血1个月入院。X线检査示右肺上叶有一个不规则肿块。护士给予该患者术前的护理,描述正确的有哪些( )
A.按外科术前护理常规
B.加强呼吸道护理
C.患者如有胸闷、气促、呼吸困难等,遵医嘱予氧气吸入
D.注意观察全身一般情况,如呼吸道症状、口腔卫生、心理、营养状况等
[多项选择]胃良性肿瘤的常见病理类型中,属于良性间叶组织肿瘤的有()。
A. 胃纤维瘤
B. 胃腺瘤
C. 胃平滑肌瘤
D. 胃脂肪瘤
E. 腺瘤性息肉
[单选题]高压开关柜前后间隔没有可靠隔离的,工作时应()。
A. 同时停电
B. 加强监护
C. 装设围栏
D.加装绝缘挡板
[单选题]下列()地质年代最长,炭化程度最高。
A.褐煤;
B.烟煤;
C.贫煤;
D.无烟煤。
[单选题]变压器中性点接地属于( )。
A.工作接地
B.保护接地
C.保护接零
D.故障接地
[多选题]螺栓紧固件检查项点有( )。
A.防松线是否错位
B.紧固件是否存在裂纹
C.紧固件是否存在锈蚀
D.紧固件是否齐全
[单项选择]新股发行网上累计投标询价发行方式从本质上说属于( )。
A. 网上定价方式
B. 网上竞价方式
C. 网上定价市值配售
D. 网上竞价市值配售
[多项选择]公民监督国家机关和国家工作人员,向违法失职行为进行的有效手段有()
A. 批评
B. 建议
C. 起诉
D. 申诉
E. 控告
[不定项选择题]共用题干 Exercising Your Memory
1. Aging does not mean a dramatic decline in memory power,unless you help it happen by letting your mind go.
2. That's not to say that memory doesn't change throughout life.Researchers divide memory into categories based on the length of time when memories are stored.One system divides it up as short-term(less than one minute;remembering a telephone number while you dial,for in-stance),long-term(over a period of years)and very long-term memory(over a lifetime).
3. Short-term memory isn't mastered until about age 7,but after that you never lose it. Long-term memory,however,involves more effort and skill and changes more through life.It's not until the early teens(十几岁)that most people develop a mature long-term memory.
4. First,we must get information into our heads through learning.Learning strategies can get rusty(生锈)without constant use. High school and college students,who are forced to repeated-ly exercise their long-term memory abilities(at least long enough to get them through a final ex- am),usually do well on memory tests.The longer you stay in school,the more chance you get to polish your learning skills.It's no wonder that more highly educated people have more effective memory skills throughout life.
5. Although older people in general learn somewhat more slowly than they did when younger,a dramatic difference exists between those who stay intellectually active—reading,discussing,tak- ing classes, thinking—and those who do not. Giving the brain daily workout(锻炼)is just as important as exercising your muscles.Brainwork keeps your learning strategies in shape,and this helps your memory to function at full capacity.
6.The next part of a healthy long-term memory is retention(记忆力),the ability to store what you have learned.Memory researchers still do not know whether memories are los—whether they still exist in the brain but our mental searching cannot turn them up,or have disappeared entirely as our brain ages.
7. The third necessity for memory is recall,the ability to bring to mind the memories we have stored .Again,while aging has widely different effects on the recall abilities of different people, research indicates that the older we get,the longer it takes to recall facts.But slower recall is still recall.In fact,aging does not seem to have any effect on forgetting at all,which takes place at the same rate in younger and older people. Paragraph 3________
A.Importance of staying intellectually active
B.Effects of aging on a person's recall ability
C.Short-term memory versus long-term memory
D.Retention as the second necessity for memory
E.Link between learning strategies and effective memory skills
F.Significance of exercising your muscles
[判断题]侧梁在枕梁间下垂检测要求以侧梁与两枕梁内侧结合处下翼板边缘为基点连线,测量连线与中梁或侧梁间的重大垂直距离。
A.正确
B.错误
[单项选择]This passage can be most likely to be entitled______.


A. The Birthplace of Coffee
B. The Effect of Coffee
C. The History of Coffee
D. The Popularity of Coffee
[单项选择]如果患了肺炎,就会发烧;此人发烧;所以,他患了肺炎。”这个推论是()
A. 有效的充分条件假言推理形式
B. 非有效的充分条件假言推理形式
C. 有效的必要条件假言推理形式
D. 非有效的必要条件假言推理形式
[单项选择]冠心病病人突感心悸、胸闷,血压为12/8 kPa(90/60mmHg),心尖部第一心音强弱不等;心电图示心房率慢于心室率,二者无固定关系,QRS波增宽为0.12秒,可见心室夺获和室性融合波。诊断为
A. 心房扑动
B. 心房颤动
C. 多发性室性早搏
D. 阵发性室上性心动过速
E. 阵发性室性心动过速
[单选题]以下关于起重吊装卸扣说法不正确的是 。
A.卸扣的受力作用点应在卸扣本身的弯曲部分和横销上
B.严禁用其它材料的螺栓取代卸扣配套横销
C.卸扣任何部位产生裂纹必须报废
D.卸扣仅产生塑性变形还可继续使用
[多项选择]急性支气管炎病人服用茶碱类药物时,应避免使用()。
A. 果汁
B. 咖啡
C. 茶
D. 可可
E. 可乐
[判断题]现金持有量过多,它所提供的流动性边际效益便会随之上升,从而使企业的收益水平提高。()
[单选题]正态分布曲线下,横轴上从均数μ到μ+1.645σ的面积为
A.47.5%
B.95%
C.90%
D.49.50A
E.45%
[多选题]具备下列哪些情形的,行政机关应当出具书面凭 证( )。
A.行政机关受理行政许可申请的
B.行政机关不受理行政许可申请的
C.行政机关在审查行政许可申请时
D.告知申请人需要补正的内容
[判断题]在二级分行工作的个贷客户经理资格申请人,本人直接向个贷中心提交《中国农业银行个贷客户经理岗位资格认定表》及相关资质证明材料复印件,初审与审批环节由个贷中心相关人员负责。
A.正确
B.错误
[单选题] 下列哪个因素对多轴航拍效果影响最大( )
A.风速
B.负载体积
C.负载类型
[单项选择]用于表示资料内容的连续性变化,反映事物数量变动趋势宜用()。
A. 直方图
B. 直条图
C. 圆图
D. 普通线图
E. 统计地图
[单选题]BD001封隔器找水不能选用( )封隔器。
A.Y21 1
B.Y221
C.Y441
D.K344
[填空题]WELL TIP HEALTH PLAN, INC.
1130 Mountainview Avenue
Denver, CO 07726
January 30, 2005
Maria Reyes, Hotel Manager
Radcliff Suites
2190 Gallop Way
Scottsdale, AZ 08543
Dear Ms. Reyes,
Our company is once again considering Well Tip’s annual March conference. For the past five years, we have held our conference in downtown Seattle, but this year we would like to provide our participation with a completely different experience. We believe that Scottsdale’s relaxed atmosphere, scenic beauty, and warm climate will provide just that and also allow our guests and employees to enjoy such activities as golf, tennis, and horseback riding.
Of course, our conference is not all fun and games. Seminars will be held from 9 a.m. to 2 p.m. every day. We need at least six conference rooms, all equipped with computers, a fax machine, and a c
[单选题]《中共山东省委山东省人民政府关于深入推进安全生产领域改革发展的实施意见》要求,各级政府要建立完善安全风险评估与论证机制,高危项目审批必须把安全生产作为前置条件,城乡规划布局、设计、建设、管理等各项工作必须以安全为前提,实行( )“一票否决”。
A.重大危险源
B.重大事故隐患
C.重大事故
D.重大安全风险
[多项选择]反乌头的中药是()
A. 瓜蒌
B. 贝母
C. 知母
D. 夏枯草
E. 半夏
[简答题]对商品征收间接税。
[单项选择]低钙血症的治疗,下列错误的是()。
A. 积极治疗病因
B. 慢性低钙血症及症状不明显者口服钙剂
C. 应用钙剂治疗不明显时,应考虑是否存在酸中毒
D. 用钙剂未能纠正者,每天给予维生素D500~5000IU
E. 每输入1500ml血,静注10%葡萄糖酸钙10ml
[单选题] 下列说法错误的是:()
A. “一机两用”行为引入计算机病毒。
B. “一机两用”行为导致公安网络被黑客攻击。
C. “一机两用”行为造成公安专网内部信息泄漏
D. “一机两用”行为基本不影响公安网
[判断题]电缆线路运行的实际温度测量,一般是采用通过电缆金属护层温度的测量来实现()。
[多选题]建设项目敏感性分析中,确定敏感因素可以通过计算( )来判断。
A.盈亏平衡点
B.评价指标变动率
C.不确定因素变动率
D.临界点
E.敏感度系数
[多项选择]下列有关收入确认的表述中,正确的有( )。
A. 属于与提供初始及后续服务相关的特许权收入应在提供服务时确认
B. 开发的商品化软件收入应在资产负债表日根据开发的完成程度确认收入
C. 广告制作的佣金收入应在资产负债表日根据完工程度确认
D. 商品售价内包括可区分的售后一定期限内的服务费,应在提供服务的期间内确认为收入
E. 商品售价内包括可区分的售后一定期限内的服务费,应在商品销售实现时确认为收入
[单项选择]患者,2天前晨起突然出现呕吐清水痰涎,脘闷不食,头眩心悸,舌苔白滑,脉滑。诊为
A. 外邪犯胃型呕吐
B. 饮食停滞型呕吐
C. 痰饮内停型呕吐
D. 肝气犯胃型呕吐
E. 胃阴不足型呕吐

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