青春期发育调查，在形态学指标中，应注意选择（）。 A.肩宽 B.足长 C.盆宽 D.

命题“∀x∈[1,2],x²-a≤0”为真命题的一个充分而不必要条件是(　　)

A．a≥4

B．a≤4

C．a≥5

D．a≤5

It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. （）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（）. A diagram graphically represents things, and the relationships between these things. These（）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.（）are used to capture the physical organization of the things in your system, i.e., how one object relates to another.（）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.

In general, a UML model is made up of one or more（）.

A．views 　

B．diagrams 　

C．user views 　

D．structure pictures

在锅炉的水压试验中，一般工作压力试验的压力应( )。

A．大于锅炉最大允许工作压力

B．等于锅炉的额定压力

C．大于锅炉的额定压力

D．等于锅炉的最大允许工作压力

在保税加工制度下，对境内企业进口的料件，只有由外商提供的，海关准予暂缓征收关税和进口环节税。( )

按现值指数计算，哪个方案可取( )

A．方案

B．乙方案

C．甲乙方案均不可

D．无法比较