问题
单项选择题 A1/A2型题
关于黏液细胞的组织学描述，正确的是（）
A.细胞分泌产物多时，细胞核扁平，位于细胞底部，染色较深
B.细胞内含有丰富的酶原颗粒
C.胞质嗜碱性，其成分为数量不等的碱性黏多糖和中性黏多糖
D.胞质内的黏原颗粒呈网状
E.胞质含PAS阳性颗粒
答案
参考答案：A
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关于黏液细胞的组织学描述，正确的是（）
A.细胞分泌产物多时，细胞核扁平，位于细胞底部，染色较深
B.细胞内含有丰富的酶原颗粒
C.胞质嗜碱性，其成分为数量不等的碱性黏多糖和中性黏多糖
D.胞质内的黏原颗粒呈网状
E.胞质含PAS阳性颗粒
参考答案：A
| 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. |
"An idea" as used in Line 5, refers to ______.
A．a model of matter
B．emission of electromagnetic radiation
C．quantums
D．the equation that described the distribution of radiation accurately over the range of low to high frequencies