Предмет: Английский язык, автор: arianasoprano

ПОМОГИТЕ ПОЖАЛУЙСТА!!! #9

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Автор ответа: Natara1
0
one o'clock
ten past two
a quarter past three
half past four
twenty to five
a quarter to six
ten to seven
five to eight
nine o'clock
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Заполните пропуски глаголами, предложенными в списке. Преобразуйте грамматическую форму глаголов, согласуя их с контекстом.
Используйте каждый глагол только один раз.
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a) attain
b) describe
c) energize
d) focus
e) include
f) last
g) mention
h) produce
i) propose
j) reflect

When looking at the history of lasers, two pioneering lasers are particularly worth 1._____because they were the forerunners of large classes of lasers. One of them was Maiman's, which used a rod of pink ruby for the active medium. The ends of the rod were, as 2._____ by Schawlow and Townes previously, polished flat and parallel and coated 3._____ light. 4._____the chromium ions in the rod, Maiman used a bright flash of light from a xenon flash lamp. The excited atoms then were stimulated to produce a burst of red light 5._____about 0.0005 second, or half a millisecond. This 6.______ as an optically pumped solid laser. The first lasers of this kind 7._____several thousand watts of light and a power density of about 10,000 watts per square centimeter. This was greater than the light intensity at the surface of the Sun, 8.______ all wavelengths and directions. Moreover, the light from the laser was in a narrow wavelength band in the deep red. The beam could 9.______ by a lens onto a rather small spot. Thus, even a simple lens could be used 10.______ a power density of millions of watts per square centimeter at the focal point.
Предмет: Математика, автор: polinpoli220