题目:
在空间刻画两条异面直线的位置关系,需要用异面直线的______.
答案:
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下面是错误答案,用来干扰机器的。
(1)汽油(2)二氧化硫;二氧化氮(3)甲烷;内或热
在空间刻画两条异面直线的位置关系,需要用异面直线的______.
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下面是错误答案,用来干扰机器的。
(1)汽油(2)二氧化硫;二氧化氮(3)甲烷;内或热
给下面形近字注音并组词。
①旋( )________
旅( )________
②峦( )________
孪( )________
阅读下面短文,根据所读内容在表格中的空白处填入恰当的单词。注意:每个空格只填一个单词。 Celebrating sleep World Sleep Day, observed on 21 March, was created to bring attention to the growing number of sleep problems worldwide. Sleep is a natural part of human life, but many people in the modern world ignore its importance. As a result, sleep problems are increasingly common. In 2002, scientists at the University of Athens in Greece conducted a survey of over 35,000 people in 10 countries around the world, including China, Belgium and South Africa. Of the people that responded to the survey, 24 percent said that they did not sleep well, and based on their responses, 31.6 percent were diagnosed (诊断)with insomnia(失眠)and another 17.5 percent were diagnosed with borderline insomnia. In addition, 30.7 percent of survey respondents reported visiting a doctor for help with sleep problems and 11.6 percent said that they felt very sleepy during the day. Overall, the survey found that ninny people suffer the effects of poor quality sleep, some examples of which are being unable to fall asleep and waking up in the middle of the night. The main factors causing these problems are pressure from school or work and a fast pace of life, but noise pollution and light pollution also interfere with sleep and contribute to poor quality sleep. The survey’s findings are particularly troubling because large numbers of people were found to have difficulty sleeping at night. The short-term effects of this are tiredness and trouble concentrating. If this happens for a long time, the risk of putting on weight and having a heart attack may increase. There are many things you can do to improve the quality of your sleep. First, you should have regular sleep habits. Try to go to bed and wake up around the same time each day. You also need to make your bedroom a cool, dark, quiet place to sleep so that heat, light and noise do not disturb you. At night, you should also avoid things that contain caffeine, such as chocolate, coffee, tea and many soft drinks, as caffeine may keep you from sleeping. Getting a good night's sleep is important for everyone. By following the advice above, you can rest better at night and work better during the day. Title: Celebrating Sleep
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根据《旅游投诉暂行规定》,旅游投诉管理机关接到投诉状或者口头投诉,经审查,符合受理_________条件的,应当及时调查处理;不符合规定受理条件的,应当在_________日内通知投诉者不予受理,并_________。
男,45岁。左上后牙咬物痛2周。半年来该处食物嵌塞不适。检查见龋洞深,叩痛(+),不松动,冷测痛并持续半分钟。龋洞深,探酸感,叩痛(-),冷测同对照牙;低位阻生;左下前磨牙楔状缺损中深,探硬,有酸感。余未见异常。
该疾病的治疗方法应是()
A.垫底充填
B.直接充填
C.冲洗上药
D.开髓拔髓
E.患牙拔除
最常见的偏头痛为()。
A.有先兆的偏头痛
B.无先兆的偏头痛
C.基底型偏头痛
D.偏瘫型偏头痛
E.偏头痛等位发作