防焦蒸汽的作用是防止（）。A、高温 B、氧化 C、油气积聚 D、结焦

对子宫动脉的描述，不正确的是（）。

A.发自髂内动脉前干

B.卵巢和输卵管的动脉血供来源于子宫动脉的上行支

C.下行支发出分支分布于子宫与 * *

D.子宫动脉频谱形态随月经周期发生变化

E.子宫动脉频谱波形可形成舒张早期"切迹"

急性胰腺炎（水肿型）的声像图表现是（）
慢性胰腺炎的声像图表现是（）
胰腺假性囊肿的声像图表现是（）
胰腺癌的声像图表现是（）

A.胰腺弥漫性肿大，轮廓清晰，实质回声增强

B.胰腺轻度增大，实质回声增强，分布不均，胰管内可见强回声，后方伴声影

C.胰腺弥漫性肿大，轮廓不清，实质回声减低

D.胰腺局部或周围可见一无回声区，边界整齐，呈圆形或分叶状

E.胰腺局限性增大，见低回声团块，边界不清，向周围组织浸润

某中的一种或几种。向该溶液中加入NaOH溶液出现白色沉淀，若加稀硫酸也出现白色沉淀并放出气体，下列判断正确的是

A．肯定含BaCl₂

B．肯定含MgCl₂

C．肯定有Na₂CO₃

D．肯定没有NaHCO₃

麦克卢汉媒介理论的缺陷有（）

A.忽视传播占有方式及使用情况的重要性

B.把人类文明发展史等同于传播史

C.使用的是静态的方法，缺乏动态分析

D.忽视了人们通过媒介发生的相互作用而几乎只关注人们面对面交流中的相互作用

E.走向技术决定论的极端

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) .

18（）

A.ranges

B.shifts

C.transfers

D.transforms