简述碳酸盐岩沉积过程和沉积作用.

女性，42岁，左侧胸痛5个月，胸闷、气短，渐加重，渐消瘦。X线胸片示左侧胸腔积液，CT示左侧胸膜凹凸不平，则最可能的诊断是

A.肺结核球

B.阿米巴肺脓肿

C.肺癌

D.细菌性肺脓肿

E.支气管扩张并肺部感染

亚洲和非洲的分界线是________。

计算机软件一般包括系统软件和( )。

A．源程序

B．应用软件

C．管理软件

D．科学计算

下列选项为放射性核素治疗转移性骨肿瘤适应证的是（）

A.细胞毒素治疗后2周

B.WBC<3.5g／L，PLT>80g／L

C.骨显像见多处放射性浓聚

D.X线片未见骨折

E.骨显像仅见溶骨性冷区

One sure way you can tell how quickly a new idea, for example, the idea of "privatization," is taking hold among the population is to monitor how fast the word or words expressing that particular idea are passing into common usage. Professional opinions of whether or not words can indeed be said to have passed into common usage are available from dictionary editors, who are vitally concerned with this question. The method described above for determining how quickly a new idea is taking hold relies on which one of the following assumptions

A．Dictionary editors are not professionally interested in words that are only rarely used.

B．Dictionary editors have exact numerical criteria for telling when a word has passed into common usage.

C．For a new idea to take hold, dictionary editors have to include the relevant word or words in their dictionaries.

D．As a word passes into common usage, its meaning does not undergo any severe distortions in the process.

E．(E) Words denoting new ideas tend to be used before the ideas denoted are understood.