Random early detection (RED) is associated with which class of service component?()
The photo _____ memories of my early childhood.
The photo _____ memories of my early childhood.
In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communications. (1) H____, fiber optics was already a well-established commercial technology when the famous paper by Kao and Hockham, (2)____(claim) the use of low-loss optical fibers for communication, appeared in 1966.
The first low-loss silica fiber was described in (3)____ which appeared in October of 1970. The date of this publication is sometimes (4)____(cite) as the beginning of the era of fiber communication. Although this development did receive (5)____(consider) attention in the research community at the time, it was far from inevitable that a major industry would evolve.
The technological barriers appeared formidable because there were serious doubts as to (6) wh_____ these fiber components could ever be produced economically enough, but the market potential was very significant. (7)____(consequence), research and development activity expanded rapidly, and a number of important issues were (8) re_____ during the early 1970s. During the middle and late 1970s,the rate of progress towards marketable products accelerated as the emphasis (9)____(shift) from research to engineering. Fibers with losses (10) app____ the Rayleigh limit of 2 dB/km at a wavelength of 0.8μm were produced.
By 1980 improvement in component performance, cost, and reliability led to major commitments on the part of telephone companies.
"ECCD"(Early Childhood Care and Education)词汇的出现说明了国外(尤其是西方)幼儿园课程()的趋势。
Early fitness spas were intended mainly for _____.
Early empathy is important for us in that it affects our later life a lot.
____
In the early 19th century,New York City was()
“Space is limited, so early registration is welcome” means ______.
Practice 2
Until early in this century, the isolationist tendency prevailed in American foreign policy. Then two factors projected America into world affairs: its rapidly expanding power, and the gradual collapse of the international system centered on Europe, the watershed presidencies marked this progression: Theodore Roosevelt’s and Woodrow Wilson’s. These men held the reins of government when world affairs were drawing a reluctant nation into their vortex. Both recognized that America had a crucial role to play in world affairs though they justified its emergence from isolation with opposite philosophies.
Roosevelt was a sophisticated analyst of the balance of power. He insisted on an international role for America because its national interest demanded it, and because a global balance of power was inconceivable to him without American participation. For Wilson, the justification of America’s international role was messianic: America had an obligation, not to the balance of power, but to spread its principles throughout the world. During the Wilson’s Administration, America emerged as a key player in world affairs, proclaiming principles which, while reflecting the truisms of American though, nevertheless marked a revolutionary departure for Old World diplomats. These principles held that peace depends on the spread of democracy, that states should be judged by the same ethical criteria as individuals, and that the national interest consists of adhering to a universal system of law.