中国古代的手工业生产，曾长期居于世界领先地位。其成就主要表现在（） A.工艺品 B.

请根据案例3 的背景信息回答第39-60 题：

假设乐天先生没有选择转贷，就乐天先生的换房规划，若届时新房贷款的年还款额等于换房当年（2019 年）住房公积金的年缴费额，除了出售旧房并尽量利用住房公积金个人账户的余额准备首付款之外，在自行投资的报酬率为7%的假设下，不考虑其他一次性投资，还要在未来10 年内每年投资（ ）。（假设住房公积金贷款的年利率为6%。为简便起见，本题假设新旧房贷均按年等额本息还款。答案取最接近值）

A．12.8 万元

B．14.0 万元

C．16.6 万元

D．20.6 万元

在使用应用程序时，常常用作在单击时执行指定的操作的控件是

A．命令按钮

B．图片框

C．复选框

D．单选按钮

（）是依赖工作叶轮的旋转而输送液体的泵。

A、回转泵

B、轴流泵

C、喷射泵

D、柱塞泵

During the past years, intelligent technology has evolved (116) three generations. The first was characterized by tools such as prolog and OPS. prolog is a simple backward-chaining environment, and OPS is a simple forward-chaining environment. This led to the second generation of knowledge-engineering environments. Its goal was to model, prototype and construct (117) systems.

A. custom B. knowledge C. through D. problem solving

All three generations were oriented toward generic (118) and represented generalized implementation environments for the construction of expert systems. knowledge bases and AI applications.
Some of the solution-oriented products are also seamlessly integrated with generic knowledge-engineering environments, permitting end users to add (119) rules and objects, as well as predefined knowledge-based logic to address problems in manufacturing simulation.
Marketplace orientation is rapidly (120) toward solution-oriented intelligent product environments. the fourth generation represents a new line of thinking and ’ develop-merit by commercial fu-ms. will reduce the cost risk and development time associated with problem solving.

已知非齐次方程组

有三个线性无关的解.

求参数λ，μ的值及方程组的通解.