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电路在正弦稳态时的网络函数随频率变化的特性，称为，频率响应特性分为特性和__特性。

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1 选词填空：The sheets are damp with sweat. You’re cold, but your heart is racing as if a killer just chased you down a dark street. It was just a nightmare, you tell yourself, there’s nothing to be afraid of. But you’re still filled with (1).Given how unsettling and haunting nightmares can be, is there a way for dreamers to (2) , or even turn off, these bad dreams as they happen?Research is (3) , but some studies suggest that people who can master lucid dreaming - that is, the ability to be (4) that a nightmare is happening and possibly even control it without waking up - may hold the (5). Nightmares are part of the human experience, especially for kids. Doctors (6) don’t consider occasional nightmares a problem. They can just be symptoms of a sleep disorder that can (7) from an unpleasant experience, stress, or certain drugs.To treat the disorder, there are a number of medicine and therapies that are backed by (8) research, according to the American Academy of Sleep Medicine, which analyzed the available research on the treatment of nightmare disorder in a recent (9) published in the Journal of Clinical Sleep Medicine.However, nightmares are complicated, and researchers are still struggling to understand them, said Dr. Rachel Salas, an expert on sleep disorders and an associate professor at Johns Hopkins Medicine in Baltimore. What we do know is that people (10) to have different kinds of nightmares at different points during the sleep cycle.A) amount B)answer C)avoid D)aware E)depart F)drastically G) fear H) limited I)mechanical J)result K)review L)rigorous M)tend N)timidity O)typically

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