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原发性高血压合并糖尿病者首选
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Passage One The first 10 months of last year saw more than 270,000 Chinese workers going abroad to work, the People’s Daily Overseas Edition reported. Currently, about 4 million Chinese workers, or 0.3 percent of the country’s population, are working in foreign countries, the newspaper said. They are living a very different and difficult life, far from home and family members. Their security and living conditions have raised concern at home and abroad. In a recent incident, five Chinese telecom workers were kidnapped in Nigeria (尼日利 [非洲中西部国家). Although they were released safely on Wednesday, the general living and working conditions of Chinese workers in that country has raised worry. There are more than 300 Chinese companies running businesses in Nigeria, involved such fields as petroleum, household appliances, and cell phones. A worker, surnamed Zhang, working for a Chinese telecom company in Nigeria, told People’s Daily that his job always required him to work outdoors. He could not be sure of having three square meals a day, or even a daily bath. Worse, malaria (疟疾) was a common disease among his colleagues. Besides their work, they also had to engage in public relations activities with the local communities. In big cities like Lagos (尼日利亚的首都), due to bad road conditions, frequent power blackouts (中断), and few public places of entertainment for the Chinese, most workers chose not to go out in the evenings, the newspaper said. Chinese workers can also be found in war-stricken countries. In Baghdad, capital of Iraq, there are about 20 telecom workers besides the Chinese diplomatic staff. Hundreds of Chinese workers are also in the Kurdistan (库尔德斯坦[在西南亚]) area of north Iraq. Most of them are working for a Norwegian oil company in exploration work. They receive a monthly salary of about $1,000 and are under the protection of the Kurdistan military, making it difficult for them to socialize with the local community. Alegria too has a large number of Chinese workers. Peng Guichen, in charge of labor services in Algeria under the China State Construction International Group, told People’s Daily there are more than 9,000 workers. Most of them were skilled, like electrical engineers, carpenters and bricklayers. "The reason they are working here is very simple--to make money," Peng told the newspaper. The monthly salaries ranged from US$400 to US$800. The number of Chinese workers going abroad has steadily increased since 2003, according to the Ministry of Labor and Social Security. Why are so many Chinese workers willing to work abroad in spite of poor conditions
男，58岁。上前牙反复肿痛4年，要求诊治。年轻时左上前牙有洞曾在医院治过。检查见右上2大面积黄白色充填物边缘发黑，叩痛(±)；右上3牙尖部折断牙冠变色，叩痛(-)，右上2、3之间唇侧龈近根尖部有瘘管口。 温度测验结果右上l23均无反应，X线片检查见右上2根尖周有约3mm×5mmX线透射区，边缘弥散。确定瘘管的病源牙的检查是( )
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