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肾上腺嗜铬细胞瘤的CT征象有哪些?

答案

参考答案：

表现为一侧肾上腺较大圆形或椭圆形肿块，直径常为3～5cm。较小肿瘤密度均一，类似肾脏密度；较大肿瘤常因内有陈旧性出血、坏死而密度不均，内有单发或多发低密度区，甚至呈囊性表现。增强检查，肿瘤明显强化，而其内低密度区无强化。

多项选择题

下列各项中，外购应税消费已纳消费税款准予扣除的有( )。

A．外购已税烟丝生产的卷烟

B．外购已税汽车轮胎生产的小轿车

C．外购已税珠宝原料生产的金银镶嵌首饰

D．外购已税石脑油为原料生产的应税消费品
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单项选择题

By examining fossilized beetles, a research team has produced the most detailed description yet of temperatures in Britain over the past 22,000 years. Fossils of species that still exist were selected and dated. When individuals of several species found in the same place were found to date to the same period, the known temperature tolerances of the existing beetle species were used to determine the maximum summer temperature that could have existed at that place and period.
The procedure of the researchers assumes which one of the following

A．Beetles can tolerate warm weather better than cold weather.

B．Fossils of different species found in the same place belonged to different periods.

C．The process of dating is more accurate for beetles than for other organisms.

D．The highest actual summer temperature at a place and period equaled the average of the highest temperatures that could have been tolerated by each of the beetle species found there and dated to that period.

E．(E) The temperature tolerance of the beetle species did not change significantly during the 22,000-year period.
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