除夕之夜，小强一家人坐在一起看电视。爷爷深有感触地说：“我年轻的时候，只能听广播

某企业生产的真空吸尘器，在其铭牌和产品说明书上的电压和标志都错误，这种情况属于( )不合格。

A．A类

B．B类

C．C类

D．D类

中学所学的A、B、C三种物质都是由H、O、S、Na中的三种元素组成的强电解质。A、B的水溶液均呈碱性，测得pH相等的A、B溶液c(A)<c(B)；C的水溶液呈酸性。有关说法正确的是

A．A是Na₂SO₃       

B.  B溶于溴水中，不可能生成沉淀

C.  B、C反应的离子方程式可能是：SO₃^－＋2H^＋→ SO₂↑＋H₂O

D. 若A、B两溶液的pH＝9，则两溶液中水电离的OH－的物质的量浓度之比为1:1

编译和解释是实现高级语言翻译的两种基本方式，相对应的程序分别称为编译器和解释器。与编译器相比，解释器（1）。编译器对高级语言源程序的处理过程可以划分为词法分析、语法分析、语义分析、中间代码生成、代码优化、目标代码生成等几个阶段；其中，代码优化和（2）并不是每种编译器都必需的。词法分析的作用是识别源程序中的（3）。

空白（3）处应选择（）

A.常量和变量 

B.数据类型 

C.记号 

D.语句

患者，女性，60岁，多年患结节性甲状腺肿，近2周右侧叶一结节明显增大，质硬，内有砂粒样钙化点，同侧颈淋巴结肿大。

超声检查甲状腺的最佳的探头频率是（）.

A.7.5MHz

B.1.5MHz

C.3.5MHz

D.2.5MHz

E.4.5MHz

Kofi Annan says helping survivors of last week’ s earthquake and (1) in the Indian Ocean is (2) . The United Nations secretary- general says countries that have offered aid must (3) and provide it. The offers add up to around (4) dollars. United Nations officials say (5) of that is needed during the next six months. The concern about offers of international aid is (6) . For example, the earthquake in Barn, Iran, in (7) of 2003 killed more than (8) people. Countries and groups offered hundreds of millions of dollars (9) .The United Nations says it has (10) only about (11) dollars in aid received so far. Governments and organizations that offered help (12) that, however. On (13) Mr. Annan met with world leaders in Jakarta, Indonesia to discuss aid for (14) . The leaders discussed and (15) the idea of (16) owed by affected nations. But the leaders did not say they would do so. Some said that (17) to survivors would be more helpful. Representatives of (18) countries and international organizations attended the meeting in Jakarta. Officials say they will cooperate to develop (19) for the Indian Ocean and the (20) .