[单选题]单盘光纤测量时应将第一标记点A设在辅助光纤和被测光缆形成的反-我要搜题网

[单项选择]Judging from recent surveys, most experts in sleep behavior agree that there is virtually an epidemic of sleepiness in the nation. "I can"t think of a single study that hasn"t found Americans getting【C1】______sleep than they ought to." says Dr. David. 【C2】______people who think they are sleeping enough would probably be【C3】______with more rest. The beginning of our sleep deficit crisis can be【C4】______to the invention of the light bulb a century ago. From diary entries and other personal【C5】______from the 18th and 19th centuries, sleep scientists have reached the【C6】______that the average person used to sleep about 9.5 hours a night. "The best sleep habits once were【C7】______on us, when we had nothing to do in the evening down on the farm, and it was dark." By the 1950s and 1960s, that sleep schedule had been reduced【C8】______, to between 7.5 and 8 hours, and most people had to wake to an alarm clock. "People cheat on their sleep, and they don"t even【C9】______they"re doing it," says Dr. David. "They think they"re okay because they can【C10】______on 6.5 hours, when they really need 7.5, 8 or even more to feel ideally【C11】______." Perhaps the most merciless robber of sleep, researchers say, is the【C12】______of the day. Whenever pressures from work, family, friends and community【C13】______, many people consider sleep the least【C14】______item on the agenda. "In our society, you"re considered【C15】______if you say you only need 5.5 hours" sleep. If you say you"ve got to get 8.5 hours, people think you lack【C16】______and ambition." To assess the【C17】______of sleep deficit, researchers have put subjects【C18】______a set of psychological and performance tests requiring them, for instance, to add columns of numbers or recall a passage read to them only minutes earlier. "We"ve found that if you"re sleep-deprived, performance【C19】______," says Dr. David. "Short-term memory is impaired,【C20】______are abilities to make decisions and to concentrate."【C10】
A. get up
B. get through
C. get along
D. get by

Operation of the Electric Cooker
Methods		Notes
a. Measure the volume of rice correctly with the pro- vided measuring cup.		* The volume (容量) of the provided measuring cup is about 0.18kg. * Wash the rice in a separate bowl, then put it into the in- ner (里面的) pot.


b. Wash the rice, then ad- just water level. Put the inner pot in the body.		* Adjust the water volume according to your own choice. * Adjust the water level on a level place * Smooth the rice surface. * Wipe the outside of the inner pot dry before putting it in the body.

[单选题]单盘光纤测量时应将第一标记点A设在辅助光纤和被测光缆形成的反射峰（）处。A.前面平滑B.中间平滑C.后面平滑D.鬼影

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[单选题]单盘光纤测量时应将第一标记点A设在辅助光纤和被测光缆形成的反射峰（）处。
A.前面平滑
B.中间平滑
C.后面平滑
D.鬼影