抗药性(resistance)
抗药性(resistance)
参考解析
解析：病原体经长期应用化疗药物后对药物反应性降低。
相关考题：
Please explain how we describe the resistance in semiconductor. Compare the resistance of a metal,poly and diffusion in tranditional CMOS process.（威盛笔试题circuit design-beijing-03.11.09）
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.
MRC是什么的缩写？（）A、Modular Radio ConnectB、Modular Resistance CabinetC、Modular Radio CabinetD、Modular Resistance Connect
According to Ohm’s Law， which of the following is correct？（）A、As voltage increases， resistance decreasesB、As amperage decreases， resistance decreasesC、As resistance decreases， amperage increasesD、As resistance increases， voltage increases
When replacing a power supply， what MUST the technician observe？（）A、voltageB、currentC、wattageD、resistance
单选题If a voltmeter is connected across a line, it must be protected with a（）AshuntBhigh-resistance coil in the armature circuitClow-resistance coil in the armature circuitDshunt and a coil of high resistance
单选题For practical purposes, in a simple series circuit, the source voltage will be dropped across one resistor if it has（）.Ahalf the resistance of the other resistorBa resistance equal to the otherCat least ten times the resistance of the otherDa partial short circuit
单选题According to Ohm’s Law， which of the following is correct？（）AAs voltage increases， resistance decreasesBAs amperage decreases， resistance decreasesCAs resistance decreases， amperage increasesDAs resistance increases， voltage increases
单选题Which of the following statements is true concerning simple parallel resistance circuits?（）AThe total current flow equals the sum of the individual currentsBThe total current flow equals the reciprocal of the sum of the individual currentsCThe total resistance equals the sum of the individual resistanceDThe total voltage equals the sum of the individual voltages across each resistance
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（）.Aboth meters in series with the resistanceBboth meters in parallel with the resistanceCthe ammeter in series and the voltmeter in parallel with the resistanceDthe ammeter in parallel and the voltmeter in series with the resistance
单选题Most conducting materials such as copper, aluminum, iron, nickel, and tungsten （）.Aincrease in resistance with increased temperatureBincrease in resistance with decreased temperatureCdecrease in resistance with increased temperatureDincrease in conductance with increased temperature
名词解释题非寄主抗性（non-host-resistance）