解热镇痛药适用于治疗

A.慢性钝痛
B.内脏绞痛
C.分娩止痛
D.外伤剧痛
E.术后剧痛

解热镇痛药镇痛的主要作用部位在

A.导水管周围灰质
B.脊髓
C.外周
D.延髓
E.脑干

1887年赫兹在研究电磁波时偶然发现，金属表面被光照射后有释放出电子的现象，这种现象叫做______。

两列波频率相等就能发生干涉现象。

A. 对
B. 错

干涉和衍射现象表明光具有性。

激光是基于受激辐射放大原理产生的一种相干光辐射。

A. 对
B. 错

一宇航员要到离地球为10光年的星球去旅行，如果飞船沿地球与星球的连线方向以相对地球v的速率飞行，宇航员测得这段路程的长度为8光年，已知光速为c，则下列说法正确的是（ ）。

A. v=0.5c
B. v=0.6c
C. v=0.7c
D. v=0.8c

1905年，爱因斯坦在他的论文《论动体的电动力学》中提出了作为狭义相对论基本原理的两条基本假设，分别是相对性原理和

当自然光在各向同性媒质界面上以布儒斯特角入射时，折射光线和反射光线相互垂直。

A. 对
B. 错

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