Different metal containing compounds emit colored light when fireworks burn. This colored light is a combination of series of colors called spectral pattern.(谱带) Each element emits its own characteristic spectral pattern, which can be used to identify the element. This allowed the scientists in 1900s to develop models of the atom's internal structure

In the chapter, we shall define the basic active and passive circuit models, explain power conventions and determine when power is delivered and absorbed, state Ohm's law and Kirchhoff's law, determine the equivalent resistance of a passive circuit containing only resistors

一、单项选择题 1.800℃,Ca(s)+CO2(g)=CaCO3(s),K0=77P0,此时CO2得分压p(CO2)为

Product development does not occur in isolation as a separate functional activity. It is a company philosophy, a basic company strategy and a multifunctional company activity. In recent years to show this all-encompassing basis, bringing together product, process, marketing and organisational innovations, there has been development of an overall innovation strategy. This innovation strategy is related to the company's overall business aims and strategy, as well as the social, economic and technological environment, and the company's own knowledge and skills. The business strategy also includes a duct strategy outlining the products of the future. The combination of the innovation and product strategies is the basis for the product development strategy, and from this can be developed

National Motto of the United States In God We Trust The phrase derives from the line \And this be our motto. 'In God is our trust, \in the battle song that later became the U.S. national anthem, \The Star-Spangled Banner. \The phrase first appeared on U. S. coins in 1864 and became

Alexander Hamiton (1755~1804) Encarta Encyclopedia, Hulton Deutsch One of the boldest American political thinkers of his time. Hamilton developed the doctrine of implied powers, which supports liberal interpretation of the U.S Constitution. He also served as the nation's first secretary of the treasury

FOUR COLONY MODELS (2) Model of New England (Puritan 1620 in Massachusetts Bay) ↓ Followed the doctrine of John Calvin (everyone had a calling given by God; read the Bible to find God's will and search for one's individual contact with God

对于超过正常使用极限状态的情况,由于其对生命财产的危害 性比超过承载力极限状态要小,因此相应的可靠度水平可比承载 正常使用极限状态的计算表达式为,S≤R S:作用效应标准值,如挠度变形和裂缝宽度,应根据荷载标 准值和材料强度标准值确定

15-3波源作简谐运动,其运动方程为y=(4.0×10-3m)s(240s1)t 它所形成的波形以30ms1的速度沿一直线传播.(1)求波的周期及波长;(2) 写出波动方程

The writing of clinical record A patient's health record plays many important roles: It provides a view of the patient's health history/status It serves as the legal document describing the healthcare services provided to the patient It provides a method for clinical communication and care