我国在人口方面的基本国策是（ ） A．保持数量稳定 B．实行计划生育 C．设法减

更换信号灯要选择电压、电流等级、型号、外形尺寸相同的合格信号灯，还要选择（）的信号灯。

A、价格相同

B、颜色相同

C、型号相同

D、接线相同

倘若小儿贫血需输血时，输注何种血液制品最合适

A.全血

B.红细胞悬液

C.血浆

D.丙种球蛋白

For nearly ten years,the Unified Modeling Language (UML) has been the industry standard for visualizing,specifying,constructing,and documenting the(1)of a software-intensive system.As the(2)standard modeling language,the UML facilitates communication and reduces confusion among project(3).The recent standardization of UML 2.0 has further extended the language's scope and viability.Its inherent expressiveness allows users to(4)everything from enterprise information systems and distributed Web-based applications to real-time embedded systems. 　　

The UML is not limited to modeling software.In fact,it is expressive enough to model (5)systems,such as workflow in the legal system,the structure and behavior of a patient healthcare system,software engineering in aircraft combat systems,and the design of hardware. 　　

To understand the UML,you need to form a conceptual model of the language,and this requires learning three major elements:the UML's basic building blocks,the rules that dictate how those building blocks may be put together,and some common mechanisms that apply throughout the UML.

空白（2）处应选择（）

A.real

B.legal

C.defacto

D.illegal

Renowned U. S. economist, John Rutledge, who helped frame the fiscal policies of two former U. S. presidents, warned that an abrupt rise in China’ s currency could lead to another Asian financial crisis. The founder of Rutledge Capital told the media that if the yuan rises (1) it would discourage foreign direct investment in China while (2) by market speculators. Currency change is more difficult for investors and (3) .
The Chinese currency has appreciated by (4) since July 2005 when the country allowed the yuan to (5) within a daily band of 0.3 percent. The analysts are expecting the currency to rise (6) by the end of this year. But if the yuan rose 20 to 30 percent, as some U. S. politicians are demanding, it would (7) causing a recession and deflation. Similar advice to allow an abrupt appreciation of a currency led to (8) in 1997, and came very close to destroying (9) . The U. S. economist says that investors want foremost to (10) associated with large fluctuations in currency and inflation. They (11) after evaluating risks to benefits such as (12) . A rising yuan would drive up labor costs for foreign investors and would not (13) .
Earlier reports said that currency speculators had pumped (14) U.S. dollars into China by the end of last year, with another 70 billion U. S. dollars (15) in the first three months of this year. There is no way to (16) of this type of investment and many economists disagree that (17) is so high. Instead of further appreciating its currency, China should make the yuan (18) . If the yuan were more easily converted into foreign currencies it would allow Chinese companies to expand overseas, (19) , and provide management experience and capital that China needs. It would also (20) and reduce speculative money coming into the country.

Renowned U. S. economist, John Rutledge, who helped frame the fiscal policies of two former U. S. presidents, warned that an abrupt rise in China’ s currency could lead to another Asian financial crisis. The founder of Rutledge Capital told the media that if the yuan rises (1) it would discourage foreign direct investment in China while (2) by market speculators. Currency change is more difficult for investors and (3) .
The Chinese currency has appreciated by (4) since July 2005 when the country allowed the yuan to (5) within a daily band of 0.3 percent. The analysts are expecting the currency to rise (6) by the end of this year. But if the yuan rose 20 to 30 percent, as some U. S. politicians are demanding, it would (7) causing a recession and deflation. Similar advice to allow an abrupt appreciation of a currency led to (8) in 1997, and came very close to destroying (9) . The U. S. economist says that investors want foremost to (10) associated with large fluctuations in currency and inflation. They (11) after evaluating risks to benefits such as (12) . A rising yuan would drive up labor costs for foreign investors and would not (13) .
Earlier reports said that currency speculators had pumped (14) U.S. dollars into China by the end of last year, with another 70 billion U. S. dollars (15) in the first three months of this year. There is no way to (16) of this type of investment and many economists disagree that (17) is so high. Instead of further appreciating its currency, China should make the yuan (18) . If the yuan were more easily converted into foreign currencies it would allow Chinese companies to expand overseas, (19) , and provide management experience and capital that China needs. It would also (20) and reduce speculative money coming into the country.

（）由纸盆、音圈、磁体等组成。当音频电流通过线圈时，音圈产生随音频电流而变化的磁场，此交变磁场与固定磁场相互作用，导致音圈随电流变化而前后运动，并带动纸盆振动发出声音。

A.电动式扬声器

B.压电陶瓷扬声器

C.压电陶瓷蜂鸣器

D.舌簧式扬声器