窦性心律时，心电图上P波应具备的条件是（　　）

【名词&注释】

心电图(electrocardiogram)、生产关系(production relations)、胆红素(bilirubin)、主要矛盾(principal contradiction)、工人阶级(working class)、排他性(exclusiveness)、脊神经(spinal nerve)、农民阶级(peasant class)、地主阶级(landlord class)、经济基础和上层建筑

[多选题]窦性心律时，心电图上P波应具备的条件是（　　）

A. P—P间隔为0．8s
B. Ⅱ、Ⅲ、aVF导联的P波直立、aVR倒置
C. Ⅱ、Ⅲ、aVF导联的P波倒置、aVR直立
D. P波时限0．10s
E. P—R间期<0．12s

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学习资料：

[单选题]新民主主义革命在全国胜利并解决土地问题以后，我国的主要矛盾是

A. 工人阶级和资产阶级的矛盾
B. 地主阶级^{(landlord class)}和农民阶级^{(peasant class)}的矛盾
C. 经济基础和上层建筑的矛盾
D. 先进的生产关系和落后的生产力之间的矛盾

[单选题]根据下列短文，回答{TSE}题。　　There are various in which individual economic units Can interact with one another．Three basic ways may be described as the market system，the administered system and the traditional system．In a market system individual economic units are free to interact among each other in themarketplace．It is possible to buy commodities from other economic units or sell commodities tothem．In a market，transactions may take place via barter or money exchange．In a barter economy，real goods such as automobiles，shoes and pizzas are traded against each other．Obviously，finding somebody who wants to bade my old Car in exchange for a sailboat may not always bean easy task．Hence，the introduction of money as a medium of exchange eases transactions considerably．In the modern market economy，goods and services are bought or sold for money．　　An alternative to the market system is administrative control by some agency over all trans．actions．This agency will issue edicts or commands as to how much of each good and service should be produced，exchanged，and consumed by each economic unit．Central 01anaing may be one way of administering such an economy．The central plan，drawn up by the government,shows the amounts of each commodity produced by the various firms and allocated to differenthouseholds for consumption．This is an example of complete planing of production，consump—tion，and exchange for the whole economy．　　In a traditional society，production and consumption paUerns are governed by tradition：everyperson’S place within the economic system is fixed by parentage，religion and custom．　　　　　Transac—tions take place on the basis of tradition，too．People belonging to a certain group or caste mayhave an obligation to care for other persons，provide them with food and shelter，care for theirhealth，and provide for their education．Clearly，in a system where every decision is made on thebasis of tradition alone，progress may be difficult to achieve．A stagnant society may result．{TS}What is main purpose of the passage?

A. To outline contrasting types of economy．
B. To explain the science of economics．
C. To argue for the superiority of one economics．
D. To compare barter and money exchange markets．

[单选题]During the Ice Ages，man developed the use of tools，and this is a way of protecting himself against________．

A. conflicts
B. hazards
C. faults
D. shortcomings

[单选题]从广州开往某地的一列火车，沿途停靠车站共12个(包括起点和终点)，则共需车票种数为(A)12(B)24(C)66(D)132

A. C

[单选题]________at his model plane over the weekend，he didn’t complete it．

A. As he worked hard
B. Hard as he worked
C. How he worked hard
D. How hard he worked

[单选题]下列关于债权的说法，不正确的是 （　　）

A. 债权是对人权
B. 债权具有排他性
C. 债权具有平等性
D. 债权具有相容性

[单选题]阻塞枉黄疸时，尿液检查结果为（　　）

A. 尿胆原减低，胆红素阳性
B. 尿胆原增高，胆红素阳性
C. 尿胆原减低，胆红素阴性
D. 尿胆原增高，胆红素阴性
E. 尿胆原正常，胆红素阳性

[单选题]脊神经^{(spinal nerve)}的有关结构中只含运动纤维的是（　　）

A. 前根
B. 后根
C. 前支
D. 后支
E. 以上都不是

[单选题]对尺神经的描述，错误的是 （　　）

A. 分布于前臂大部分屈肌
B. 损伤后拇指不能内收
C. 发自臂丛内侧束
D. 损伤后屈腕力量减弱
E. 行程中经过尺神经沟

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