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患者女，27岁，上前牙牙龈反复出现瘘管1年，经多次搔刮及烧灼瘘管无明显好转。查体见左上1烤瓷全冠修复，唇侧龈方见针尖大小脓点，略红肿，X线片显示根管内冠1／3铸造桩影像，根尖3mm欠充填，根尖区见阴影 。

进行以上治疗前或治疗过程中应注意 （）

A.查血常规及凝血

B.小心取出根桩避免根管侧穿孔

C.注意保护正常黏膜

D.全身应用抗生素

E.扩大瘘口便于排脓

答案

参考答案：B

单项选择题

光射到两种不同介质的分界面，分析其后的传播情形可知（）

A、折射现象的出现表明光是纵波

B、光总会分为反射光和折射光

C、折射光与入射光的传播方向总是不同的

D、发生折射是因为光在不同介质中的传播速度不同
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单项选择题

A variety of illegal acts committed by people in the course of their employment, for their own personal gain, are collectively known as white-collar crime. Embezzlement, theft and trading securities (1) insider information are common forms of white-collar crime. The majority of cases involve low-level employees who steal because they are under (2) financial stress. Many plan to (3) the money back as soon as possible but may never do so. Their crimes are usually never (4) because the amounts of money are small, and no one notices the (5) .

(6) , there are some very large cases of white-collar crime, such as multimillion-dollar stock market or banking seams that take years to discover and are extremely difficult and expensive to (7) .

White-collar crime is not (8) to the business sector. Government employment, especially (9) the city level, also provides opportunities to (10) one’s pockets. (11) , building inspectors accept bribes and full-time employees receive (12) payments.

Although white-collar crime is less (13) than street crime, it involves (14) more money and harm to the public than crimes committed by street criminals. It is (15) that there are more criminals (16) the office suites than in the streets, yet the (17) of white-collar makes it difficult to uncover the offenses and pursue the offenders. As the economy (18) from manufacturing to services and electronic commerce, opportunities for white-collar crime (19) , while the technology needed to stop such crimes will (20) .

20（）

A. pick up

B. pay back

C. make out

D. lag behind
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