下图为20世纪以来美国底特律市城市人口总数变化图。权威机构推测其2100年将变“

用黏性土进行基槽回填，一般采用的压实方法为（）。

A.碾压法

B.夯实法

C.振动压实法

D.机械压实法

For nearly ten years, the Unified Modeling Language (UML) has been the industry standard for visualizing, specifying, constructing, and documenting the (26) of a software-intensive system. As the (27) standard modeling language, the UML facilitates communication and reduces confusion among project (28) The recent standardization of UML 2.0 has further extended the language’s scope and viability.Its inherent expressiveness allows users to
(29) 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 (30) 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.

A．non-hardware

B．non-software

C．hardware

D．software

NA为阿佛加德罗常数，下述正确的是（）

A、80g硝酸铵含有氮原子数为2NA

B、1L1mol/L的盐酸溶液中，所含氯化氢分子数为NA

C、标准状况下，11.2L四氯化碳所含分子数为0.5NA

D、在铜与硫的反应中，1mol铜失去的电子数为2NA

香豆素碱水解时若在碱水中长时间加热后，加酸后的最终产物是（）

A.顺邻羟基桂皮酸盐

B.反邻羟基桂皮酸盐

C.顺邻羟基桂皮酸

D.反邻羟基桂皮酸

E.以上均不正确