为了向上或向下滚动一层屏幕，，可用（）方法实现。 A.用鼠标单击滚动条之上或之下的滚

肺总容量减去余气量的值是（）

A.潮气量

B.补吸气量

C.补呼气量

D.肺活量

E.肺泡通气量

一颗子弹在枪膛中所受平均推力约为600N，枪管长1.2m，子弹离开枪口后又飞行500m,推力做功为        J。

2007年该地农村居民人均纯收入4985元，比上年增长14.1%，扣除物价上涨因素后，实际增长8.4%。其中，工资性收入1951元，增长16.7%；经营性收入2701元，增长12.1%；财产性收入144元，增长13.1%；转移性收入190元，增长19.0%。人均生活消费支出3622元，增长15.2%。其中，食品支出1369元，增长14.9%；用于交通和通讯消费的支出422元，增长19.9%。农村居民人均住房面积31.7平方米，增加1.0平方米。

2007年该地农村居民人均纯收入中工资性收入所占比重（）。

A.49.1%

B.39.1%

C.38.5%

D.40.6%

It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. (71) is a means to capture ideas, relationships, decisions, and requirements in a well-defined notation that can be applied to many different domains. Modeling not only means different things to different people, but also it can use different pieces of UML depending on what you are trying to convey. In general, a UML model is made up of one or more (72) . A diagram graphically represents things, and the relationships between these things. These (73) can be representations of real-world objects, pure software constructs, or a description of the behavior of some other objects. It is common for an individual thing to show up on multiple diagrams; each diagram represents a particular interest, or view, of the thing being modeled. UML 2.0 divides diagrams into two categories: structural diagrams and behavioral diagrams. (74) are u sed to capture the physical organization of the things in your system, i.e., how one object relates to another. (75) focus on the behavior of elements in a system. For example, you can use behavioral diagrams to capture requirements, operations, and internal state changes for elements.

A．Programming

B．Analyzing

C．Designing

D．Modeling

圆钢制品配件焊后或焊完热调后，均应置于（）℃以上静止空气中缓冷，严禁与水接触。

A.5

B.6

C.10