抗药性(resistance)

题目
抗药性(resistance)


相似考题

4.共用题干 第二篇Superconducting Ceramic(陶瓷)An underaround revolution beqins this winter. With the flip(轻击)of a switch, 30,000 homes in one part of Detroit will soon become the first in the country to receive electricity transmitted by ice-cold high-performance cables.Other American cities are expected to follow Detroit's example in the years ahead,which could conserve enormousamounts of rower.The new electrical cables at the Frisbie power station in Detroit are revolutionary because they are made of superconductors.A superconductor is a material that transmits electricity with little or no resistance.Resistance is the degree to which a substance resists electric current.All common electrical conductors have a certain amount of electrical resistance.They convert at least some of the electrical energy passing through them into waste heat.Superconductors don't.No one understands how superconductivity works.It just does.Making superconductors isn't easy.A superconducting material has to be cooled to an extremely low temperature to lose its resistance.The first superconductors,made more than 50 years ago,had to be cooled to -263 degrees Celsius before they lost their resistance.Newer superconducting materials lose their resistance at-143 degrees Celsius.The superconductors cable installed at the Frisbie station is made of a ceramic material that contains copper,oxygen,bismuth(秘),strontium(锶)and calcium (钙).A ceramic is a hard,strong compound made from clay or minerals.The superconducting ceramic has been fashioned into a tape that is wrapped lengthwise around a long tube filled with liquid nitrogen.Liquid nitrogen is supercold and lowers the temperature of the ceramic tape to the point where it conveys electricity with zero resistance.The United States loses an enormous amount of electricity each year to resistance. Because cooled superconductors have no resistance,they waste much less power. Other cities are watching the Frisbie experiment in the hope that they might switch to superconducting cable and conserve power,too.Compared to common electrical conductors,superconductorsA:have little or no electrical resistance.B:can be used for a long time.C:are not energy-efficient.D:can be made easily.

参考答案和解析
答案:
解析:
病原体经长期应用化疗药物后对药物反应性降低。
更多“抗药性(resistance)”相关问题
  • 第1题:

    抗病性(resistance to disease)


    正确答案: 是指植物避免、中止或阻滞病原物侵入与扩展,减轻发病和损失程度的一类特性。

  • 第2题:

    抗药性(drug resistance)


    正确答案: 微生物通过改变本身生理生化特性而变得对化学药物不敏感,即微生物的抗药性。

  • 第3题:

    曲线阻力 curve resistance


    正确答案: 车辆溜经曲线时(包括道岔导曲线),由于离心力的作用,曲线内外轨长度不等,以及车辆心盘、旁承的转动摩擦等原因而产生的阻力叫曲线阻力。

  • 第4题:

    When replacing a power supply, what MUST the technician observe?()

    • A、voltage
    • B、current
    • C、wattage
    • D、resistance

    正确答案:C

  • 第5题:

    名词解释题
    抗病性(resistance to disease)

    正确答案: 是指植物避免、中止或阻滞病原物侵入与扩展,减轻发病和损失程度的一类特性。
    解析: 暂无解析

  • 第6题:

    单选题
    If a voltmeter is connected across a line, it must be protected with a()
    A

    shunt

    B

    high-resistance coil in the armature circuit

    C

    low-resistance coil in the armature circuit

    D

    shunt and a coil of high resistance


    正确答案: C
    解析: 暂无解析

  • 第7题:

    单选题
    The unit of electrical resistance is the ()
    A

    ampere

    B

    volt

    C

    watt

    D

    ohm


    正确答案: B
    解析: 暂无解析

  • 第8题:

    名词解释题
    抗逆性(resistance)

    正确答案: 植物是在长期进化过程中,对变化着的环境产生了很强的适应性,对一些不良条件产生了忍耐性和抵抗性,这种适应、忍耐和抵抗性可统称为抗逆性,包括抗病性、抗虫性、抗寒性等。
    解析: 暂无解析

  • 第9题:

    名词解释题
    诱发抗病性(inducing resistance)

    正确答案: 是植物经各种生物预先接种后或受到化学因子、物理因子处理后所产生的抗病性,也称为获得抗病性(acquired resistance)。
    解析: 暂无解析

  • 第10题:

    单选题
    A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter methodTherefore, the meters should be connected with().
    A

    both meters in series with the resistance

    B

    both meters in parallel with the resistance

    C

    the ammeter in series and the voltmeter in parallel with the resistance

    D

    the ammeter in parallel and the voltmeter in series with the resistance


    正确答案: C
    解析: 暂无解析

  • 第11题:

    名词解释题
    非寄主抗性(non-host-resistance)

    正确答案: 一种病原物只能侵害特定的寄主种类,而不能侵染其他种类的植物,不能与寄主以外的植物建立寄生关系,这些植物的抗性称为非寄主抗性。
    解析: 暂无解析

  • 第12题:

    害虫抗药性可分为获得抗药性和自然抗药性两大类。


    正确答案:正确

  • 第13题:

    抗逆性(resistance)


    正确答案: 植物是在长期进化过程中,对变化着的环境产生了很强的适应性,对一些不良条件产生了忍耐性和抵抗性,这种适应、忍耐和抵抗性可统称为抗逆性,包括抗病性、抗虫性、抗寒性等。

  • 第14题:

    According to Ohm’s Law, which of the following is correct?()

    • A、As voltage increases, resistance decreases
    • B、As amperage decreases, resistance decreases
    • C、As resistance decreases, amperage increases
    • D、As resistance increases, voltage increases

    正确答案:C

  • 第15题:

    问答题
    简述自然抗药性和获得抗药性。

    正确答案: 自然抗药性:昆虫在不同发育阶段, 不同生理状态及所处的环境条件的变化对药剂产生不同的耐药力。
    获得抗药性:指昆虫具有忍受杀死正常种群大多数个体的药量的能力,并在种群中发展起来的现象。
    获得抗药性又分为以下几种类型:
    (1)单一抗药性:某种害虫只对一种药剂有抗性,称为单一抗药性。但有时由于抗性生化机制关系,对该药的其他同系物也有抗性,这仍属于单一抗性。
    (2)多抗性:昆虫的一个品系由于存在多种不同的抗性基因或等位基因,能对几种或几类药剂都产生抗性。
    (3)交互抗性:昆虫的一个品系由于相同抗性机理,对于选择药剂以外的其他从未使用过的一种药剂或一类药剂也产生抗药性的现象。
    (4)负交互抗性:是指昆虫的一个品系对一种杀虫剂产生抗性后,反而对另一种未用过的药剂变得更为敏感的现象。
    解析: 暂无解析

  • 第16题:

    名词解释题
    微效基因抗病性(minor gene resistance)

    正确答案: 由多数微效基因控制,抗病性遗传表现为数量性状所控制。
    解析: 暂无解析

  • 第17题:

    单选题
    For practical purposes, in a simple series circuit, the source voltage will be dropped across one resistor if it has().
    A

    half the resistance of the other resistor

    B

    a resistance equal to the other

    C

    at least ten times the resistance of the other

    D

    a partial short circuit


    正确答案: A
    解析: 暂无解析

  • 第18题:

    单选题
    According to Ohm’s Law, which of the following is correct?()
    A

    As voltage increases, resistance decreases

    B

    As amperage decreases, resistance decreases

    C

    As resistance decreases, amperage increases

    D

    As resistance increases, voltage increases


    正确答案: C
    解析: 暂无解析

  • 第19题:

    名词解释题
    英译汉:resistance

    正确答案: 电阻
    解析: 暂无解析

  • 第20题:

    单选题
    Which of the following statements is true concerning simple parallel resistance circuits?()
    A

    The total current flow equals the sum of the individual currents

    B

    The total current flow equals the reciprocal of the sum of the individual currents

    C

    The total resistance equals the sum of the individual resistance

    D

    The total voltage equals the sum of the individual voltages across each resistance


    正确答案: A
    解析: 暂无解析

  • 第21题:

    单选题
    Most conducting materials such as copper, aluminum, iron, nickel, and tungsten ().
    A

    increase in resistance with increased temperature

    B

    increase in resistance with decreased temperature

    C

    decrease in resistance with increased temperature

    D

    increase in conductance with increased temperature


    正确答案: B
    解析: 暂无解析