55岁,左下后牙咬物酸软1年余,曾于外院补牙,效果不明显,咬物仍酸软,喝汤时疼痛。查

题型:单项选择题

问题:

55岁,左下后牙咬物酸软1年余,曾于外院补牙,效果不明显,咬物仍酸软,喝汤时疼痛。查:左下第一磨牙远中咬合面大面积充填体,叩诊(+),X线片示已进行根管治疗,髓顶未揭全,根尖有暗影 左下第二前磨牙龋坏达牙本质中层。

还应进行的检查是

A.咬诊

B.扪诊

C.温度测验

D.牙周探诊

E.麻醉法测验

考点:口腔执业助理医师口腔执业助理医师
题型:单项选择题

引起地方性氟中毒最主要的因素是()

A.食物中氟含量过高

B.土壤中氟含量过高

C.饮水中氟含量过高

D.饮水中氟含量过低

E.维生素A和钙缺乏

题型:单项选择题

行政复议机关履行行政复议职责,应当遵循的原则有()。

A.公平、公开、公正

B.合法、平等、公开

C.有错必纠、有错改之

D.及时、便民

题型:单项选择题

有如下模板声明:   templateclassA;   下列声明中,与上述声明不等价的是(  )。

A.templateclassA;

B.templateclassAt;

C.templateclassA;

D.templateclassA;

题型:单项选择题

××热力发电厂,主要生产工艺单元有:贮煤场、煤粉制备与输煤系统、燃烧系统、汽水系统、凝结水系统、化学水系统、循环水系统、除灰渣与除尘脱硫系统、制氢系统、配电与送电系统、车库等。大型设备主要有:锅炉、汽轮机、发电机、磨煤机、制氢装置、水处理装置、除尘装置等。发电用燃煤,由汽车直接运往贮煤场,在贮煤场用滚轴筛将煤破碎后送进燃煤锅炉。
制氢系统包括制氢装置和氢气储罐。制氢装置为配套电解制氢设备及其管路等。运行时装置中存有的氢气为50kg,与制氢装置边缘距离为30m处,有6个24m3额定工作压力为3.2MPa,额定工作温度为20℃卧式储罐,作为生产成品的周转储罐。制氢装置与氢气储罐用管道连接。
锅炉点火助燃为柴油。厂内有两个2000m3的固定储罐存储了柴油。罐的设计充装系数为0.85,两柴油罐在同一围堰内,在距制氢系统外部边界550m处有一个汽油储罐区,有两个20m3卧式汽油储罐,储罐的设计充装系数为0.85,两个汽油储罐在同一围堰内。
相关资料:氢气在0℃,0.1MPa环境中的密度为0.09kg/m3,所用汽油的密度为750kg/m3,所用柴油的密度830kg/m3。标准GB18218—2000《重大危险源辨识》中给出,氢气在生产场所的临界量为1t,在贮存区临界量为10t,汽油在生产场所的临界量为2t,在贮存区的临界量为20t。
请根据上述情景,回答下列问题:1.按GB6441—1986《企业职工伤亡事故分类标准》,指出该电厂可能发生的事故类别及其所在的生产工艺单元。
2.按GB/T 13861—1992《生产过程危险和有害因素分类与代码》给出的危险、有害因素及分类,指出该电厂存在的化学性危险、有害因素及其对应的物质名称。
3.按照GB18218—2000《重大危险源辨识》给出的危险物质及其临界量,选做以下两题中任一个:
(1)找出该电厂两处危险源及名称。
(2)计算出两处危险源中任一处的储量。
4.指出该电.厂可能发生爆炸的主要设备和设施,并指出预防其发生爆炸的保护装置或设备。

题型:单项选择题

I am an e-mail user.When I first started to use the e-mail system. I used to read all my e-mail.I didn’t have much mail.1 was very excited about receiving any e-mail.I gave my friends my e-mail address.Soon I had more mail than 1 wanted.Some of the mail was junk mail.1 was worried.I didn't want my mail to control me.

I've tried some methods to help me get control of my mail.First,I check my mail at the same time every day.Also I try to allow myself only 15-20 minutes every day to process my e-mail.This doesn't always work,but I try.Sometimes I save the messages.Sometimes I just read them,maybe answer a few,and then delete them.Sometimes I'm not at all interested in a message,so I don't even open it.I delete it right away.This is very much the way I go through the mail that the postal service delivers to my home.

These methods are very simple.I have some friends who are very clever with computers.From time to time,they teach me new tricks for managing my e-mail.I've also learned to transfer(转存)some messages to a disk so they don't fill up my mail files(文件夹).Then I can read them later and maybe use them in my work.I'm still amazed at what e-mail can do for me! I'm still worried,however,about having too much to read.

小题1:The writer used to read all his e-mail because __________.

A.he didn’t have much mail

B.he had nothing else to do

C.he didn’t know how to read mail

D.he was forced to do that小题2:Which of the following does NOT belong to the ways of the writer’s dealing with his mail?

A.Saving the message

B.Just reading more

C.Deleting some

D.Passing some into friends小题3:What does the underlined word “they” in the last paragraph refer to?

A.messages

B.friends

C.computers

D.methods小题4:What’s the purpose of the writer to write this passage?

A.To share happiness in using mail with us

B.To share some worries in using mail with us

C.To share some methods of using computer with us

D.To persuade us out of using mail

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