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Can dogs and cats live in perfect harmony in the same home? People who are thinking about adopting a dog as a friend for their cats are worried that they will fight. A recent research has found a new recipe of success. According to the study, if the cat is adopted before the dog, and if they are introduced when still young (less than 6 months for cats, a year for dogs), it is highly probable that the two pets will get along swimmingly . Two-thirds of the homes interviewed reported a positive relationship between their cat and dog. However, it wasn’t all sweetness and light. There was a reported coldness between the cat and dog in 25% of the homes, while aggression and fighting were observed in 10% of the homes. One reason for this is probably that some of their body signals were just opposite. For example, when a cat turns its head away it signals aggression, while a dog doing the same signals submission. In homes with cats and dogs living peacefully, researchers observed a surprising behavior. They are learning how to talk each other’s language. It is a surprise that cats can learn how to talk ‘dog’, and dogs can learn how to talk ‘cat’. What’s interesting is that both cats and dogs have appeared to develop their intelligence. They can learn how to read each other’s body signals, suggesting that the two may have more in common than we previously suspected. Once familiar with each other’s presence and body language, cats and dogs can play together, greet each other nose to nose, and enjoy sleeping together on the sofa. They can easily share the same water bowl and in some cases groom (梳理) each other. The significance of the research on cats and dogs may go beyond pets — to people who don’t get along, including neighbors, colleagues at work, and even world superpowers. If cats and dogs can learn to get along, surely people have a good chance. 小题1:The underlined word “swimmingly” in Paragraph 1 is closest in meaning to “without _________”. A.a message B.a problem C.introduction D.delay 小题2:Some cats and dogs may fight when _________. A.they are cold to each other B.they look away from each other C.they misunderstood each other’s signals D.they are introduced at an early age 小题3:What is found surprising about cats and dogs? A.They eat and sleep each other. B.They observe each other’s behaviors. C.They learn to speak each other’s language. D.They know something from each other’s voices. 小题4:It is suggested in Paragraph 4 that cats and dogs _________. A.have common interests B.are less different than was thought C.have a common body language D.are less intelligent than was expected 小题5:What can we human beings learn from cats and dogs? A.We should learn to live in harmony. B.We should know more about animals. C.We should live in peace with animals. D.We should learn more body languages.
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【判断题】应收账款是企业销售商品等尚未收到的款项,应以实际发出货物的时间作为其入账的时间。 ( )
A.
正确
B.
错误
【单选题】红宝石激光器的波长为 694.3nm ,计算该激光的频率(以 THz 为单位)。
A.
442
B.
432
C.
422
D.
412
【单选题】临床药学的业务范围不包括
A.
药品信息服务
B.
治疗药物监测
C.
医院药品调剂
D.
药品不良反应报告
E.
药物利用研究评价
【简答题】在精馏塔中,加料板以上的塔部分称为 。
【单选题】在红宝石 Q 调制激光器中,有可能将几乎全部 Cr 3 + 离子激发到激光上能级并产生激光巨脉冲。设红宝石棒直径 1cm ,长度 7.5cm , Cr 3 + 离子浓度为 2 × 10 19 cm -3 ,巨型脉冲宽度为 10ns ,求输出激光的最大能量和脉冲功率 ( 红宝石 激光器为三能级系统,波长取 694.3nm ) 。 激光的最大能量 为:
A.
33.7J
B.
16.8J
C.
8.4J
【单选题】[ 2019上●中学] 某中学教师黄某认为自已学历和能力都已达标,拒绝参加教育行政部门利用假期组织的教师培训活动。黄某的做法( )
A.
正确,教师可以放弃个人权利
B.
不正确,教师不能放弃培训的权利
C.
正确,教师享有专业自主权利
D.
不正确,提升业务水平是教师义务
【单选题】世界上第一台激光器——红宝石激光器的 波长为 694.3nm。 其频率为
A.
474THz
B.
300THz
C.
432THz
【单选题】在红宝石 Q 调制激光器中,有可能将几乎全部 Cr 3 + 离子激发到激光上能级并产生激光巨脉冲。设红宝石棒直径 1cm ,长度 7.5cm , Cr 3 + 离子浓度为 2 × 10 19 cm -3 ,巨型脉冲宽度为 10ns ,求输出激光的最大能量和脉冲功率 ( 红宝石 激光器为三能级系统,波长取 694.3nm ) 。 脉冲功率 为:
A.
3.37GW
B.
1.68GW
C.
8.4GW
【单选题】在红宝石 Q 调制激光器中,有可能将几乎全部 Cr 3 + 离子激发到激光上能级并产生激光巨脉冲。设红宝石棒直径 1cm ,长度 7.5cm , Cr 3 + 离子浓度为 2 × 10 19 cm -3 ,巨型脉冲宽度为 10ns ,求输出激光的最大能量和脉冲功率 ( 红宝石 激光器为三能级系统,波长取 694.3nm ) 。 红宝石 晶体中 Cr 3 + 离子 数目为:
A.
4.72x10^20(20为上标,下同)
B.
1.18x10^20
C.
2.36x10^20
【单选题】(2019· 太原名校高三联合训练, 9) 牛至是一种质地坚硬、树枝茂密的多年生药草,下列三种结构简式表示的物质 是从牛至中提取出来的活性成分。下列有关说法正确的是 ( ) A . c 分子中最多有 7 个碳原子共平面 B .可用溴的 CCl 4 溶液将 a 、 b 两种物质区别开 C .完全燃烧 1 mol 三种物质时消耗氧气的量: a > c > b D . a 分子与 HCl 发生加成反应时...
A.
B.
C.
D.
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