参考答案:B
[考点]新生儿出生后血液循环建立
[分析]胎儿循环时肺循环压力高,体循环压力低,血液由胎胚通过脐静脉、动脉导管、卵圆孔,进入胎儿体内。出生后断脐带,呼吸建立(啼哭)逐渐肺小动脉肌层退化,动脉导管关闭,卵圆孔关闭,肺循环压力下降和体循环的压力增高,建立肺循环和体循环,肺动脉平均压20mmHg,体循环压力达100~120mmHg。
[分析] 题中as much...as是一固定结构,意思是“和……一样、正如……”。后一个as引出的是一个主
第24题: [单项选择]在电压相等情况下,若将一个交流电磁铁接到直流电流上使用,将会发生()。
A. 线圈电流增大,发热,甚至烧坏
B. 噪音
C. 吸力减小
D. 铁损增加
参考答案:A
第25题: [单项选择]Firms hold regular sales conferences because they can _______.
A. exchange information about the business.
B. receive higher education.
C. travel around the world.
D. take the opportunities to stay together with their colleagues.
参考答案:A
答案解析:参见文章最后一段。公司定期召开公司所有销售人员参加的销售会,是为了互相见见面,交流信息,询问有关新产品的情况,并接受培训。
第26题:[单选题]电源及环境监控系统中,( )可以实时采集监控对象的运行参数和工作状态,收集故障告警信息,并送往监控单元SU。
A.监控模块SM
B.监控单元SU
C.监控站SS
D.监控中心SC
参考答案:A
(出自《铁路通信工(现场综合维护)》P114)
第27题:[不定项选择题]足三阴经在内踝上8寸以下的分布规律是
A.少阴在前、厥阴在中、太阴在后
B.厥阴在前、少阴在中、太阴在后
C.太阴在前、厥阴在中、少阴在后
D.太阴在前、少阴在中、厥阴在后
E.厥阴在前、太阴在中、少阴在后
参考答案:E
第28题:[填空题]通用继电器的结构,主要有安装底座、电磁机构、( )及外罩器部分组成。
参考答案:触头系统
第29题:[判断题]判断题新入职员工经培训取得基础岗位资格后,方可上岗。
A.正确
B.错误
参考答案:A
第30题:[判断题]在女职工经期不得安排其从事高空、低温、冷水作业和国家规定的第4级体力劳动强度的劳动。
A.正确
B.错误
参考答案:B
第31题: [多项选择]下列厂房中,属于甲类火灾危险性的有()。
A. 甲醇生产厂房
B. 松节油生产厂房
C. 植物油浸出厂房
D. 甘油制备厂房
E. 沥青加工厂房
参考答案:A, C
答案解析:由于甲醇生产厂房、植物油浸出厂房的火灾危险性为甲类;松节油生产厂房的火灾危险性为乙类;甘油制备厂房、沥青加工厂房的火灾危险性为丙类,因此,正确答案为A、C
第32题: [多项选择]Topic: On Knowledge and Ability
参考答案:[参考范文]
On Knowledge and Ability
When it comes to the topic of knowledge and abi lity,there are various viewpoints among people.Some people hold the idea that a knowledgeable person tends to become suc cessful in our society,while others think that it is useless to own a lot of knowledge but without practical ability.therefore in their opinion ability is more important.As far as I’m concerned,both knowledge and ability are significant to our development,and we should combine knowledge with ability but not separate them.
In the first place,in our daily life we often see such a kind of people who own much theoretical knowledge.However,when a small task is assigned to them,they fail to fulfill it or do it badly.Similarly,some students who has just graduated from university have to confront with difficulty of looking for jobs,for the companies they apply for are not sure whether they have got ability to be competent for the job.Those who can prove their abiiity will win the position more easily.So it is not enough to only possess knowledge.
In the second place,it is limited for a person’s development without solid basis of knowledge.The story of former entrepreneurs is a good example.With their preeminent ability and courage,they founded many enterprises that played significant roles in national economy.But a serious problem they have to consider is that the knowledge they possess has not been sufficient to manage a developing enterprise, hence they go to university to enrich their knowledge of different aspects and employ talents with professional knowl edge. So I can say knowledge is the springs of ability, it ensures our ability not to dry up.
In conclusion, it is undoubted that knowledge is as important as ability. We should continue to assimilate knowledge while improving our ability in practice. Only in this way can we become real talents.
第33题:[单选题]某工程施工有两个技术方案可供选择,甲方案投资180万元,年生产成本为45万元,乙方案需投资220万元,年生产成本为40万元,设基准投资收益率为12%,若采用增量投资收益率评价两方案,则( )。
A.甲方案优于乙方案
B.甲乙两个方案的效果相同
C.乙方案优于甲方案
D.甲乙两个方案的折算费用相同
参考答案:C
2020版教材83 / 2019版教材P81
(45-40)/(220-180)=0.125大于0.12是可行的。
第34题:[单选题]国体和政体的关系属于( )
A.本质和现象的关系
B.内容和形式的关系
C.必然和偶然的关系
D.普遍和特殊的关系
参考答案:B
第35题:[判断题]砍剪树木应有人监护。
A.正确
B.错误
参考答案:A
第36题: [单项选择]数控系统的面板主要由功能键、显示器和()组成。
A. 地址键
B. 编辑键盘
C. 机床操作面板
D. 软功能键
参考答案:B
第37题:[简答题]车体涨出超过什么程度禁止编入列车?
参考答案:答:空敞车车体涨出超过80mm,重敞车车体涨出超过150mm,禁 止编入列车。
第38题: [单项选择]从本质上说市场是( )关系的总和。
A. 商品交换
B. 商品生产
C. 货币生产
D. 物质交换
参考答案:A
第39题:[判断题]开关量输出通道的作用是把开关量信号转化成计算机易于接受的形式,并且采取一定的隔离措施。
A.正确
B.错误
参考答案:B
第40题:[判断题][T]BB010321马达的头数越少,转速越低,扭矩越大。()
A.正确
B.错误
参考答案:B
马达的头数越少,转速越高,扭矩越小。
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