问题
单项选择题
按照传播途径，预防流行性出血热应采取的措施是
A．空气消毒
B．日常生活用品消毒
C．饮水，食品，用品消毒
D．多途径消毒，杀虫，灭鼠
E．以上均不完全合适
答案
参考答案：D
解析：流行性出血热为自然疫源性疾病。鼠为主要传染源，传播途径由呼吸道、消化道、接触、母婴、虫媒传播。主要与鼠的排泄物或被空气污染的物质有关。故选D。
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按照传播途径，预防流行性出血热应采取的措施是
A．空气消毒
B．日常生活用品消毒
C．饮水，食品，用品消毒
D．多途径消毒，杀虫，灭鼠
E．以上均不完全合适
参考答案：D
解析：流行性出血热为自然疫源性疾病。鼠为主要传染源，传播途径由呼吸道、消化道、接触、母婴、虫媒传播。主要与鼠的排泄物或被空气污染的物质有关。故选D。
| Awarded the Nobel Prize for physics in 1918, German physicist Max Planck is best remembered as the originator of the quantum theory. His work helped usher in a new era in theoretical physics and revolutionized the scientific community’s understanding of atomic and subatomic processes. Planck introduced an idea that led to the quantum theory, which became the foundation of twentieth century physics. In December 1900, Planck worked out an equation that described the distribution of radiation accurately over the range of low to high frequencies. He had developed a theory which depended on a model of matter that seemed very strange at the time. The model required the emission of electromagnetic radiation in small chunks or particles. These particles were later called quantums. The energy associated with each quantum is measured by multiplying the frequency of the radiation, v, by a universal constant, h. Thus, energy, or E, equals hv. The constant, h, is known as Planck’s constant. It is now recognized as one of the fundamental constants of the world. Planck announced his findings in 1900, but it was years before the full consequences of his revolutionary quantum theory were recognized. Throughout his life, Planck made significant contributions to optics, thermodynamics and statistical mechanics, physical chemistry, among other fields. |
In which of the following fields did Max Planck NOT make a significant conla4bution
A．Optics.
B．Thermodynamics.
C．Statistical mechanics.
D．Biology.