因瓦斯超限被瓦斯监测仪自动切断电源的工作面，在瓦斯浓度降至规定值以下时，可实行自动复

税务机关需要将已开具的发票调出查验时，应当向被查验的单位和个人开具（）。

A、发票换票证

B、开具同等效力的发票证明

C、收据

D、检查底稿

商业银行为客户提供的各种专业化理财服务是一个循序渐进的有机整体，下面四种服务的排列顺序，正确的是（）。

A.财务规划、财务分析、投资建议、个人投资产品推介

B.财务规划、财务分析、个人投资产品推介、投资建议

C.财务分析、财务规划、投资建议、个人投资产品推介

D.财务分析、投资建议、个人投资产品推介、财务规划

下列描述中，错误的是

A．Java要求编程者管理内存

B．Java的安全性体现在多个层次上

C．Applet要求在支持Java的浏览器上运行

D．Java有多线程机制

关于征收与征用的异同，下列说法错误的是( )。

A．征收与征用的主体都是国家
B．征收与征用都是仅适用于所有权
C．征收是财产所有权发生了变化；征用是所有权没有变化
D．征收是针对不动产；征用则于不动产和动产均可适用

Ragtime is a musical form that synthesizes folk melodies and musical techniques into a brief quadrille-like structure, designed to be played—exactly as written—on the piano. (46) A p analogy exists between European composers like Ralph Vaughan Williams and Edward Grieg, who combined folk tunes and their own original materials in larger compositions and the pioneer composers in the United States. Composers like Scott Joplin and James Scott were in a sense collectors or musicologists, collecting dance and folk music in Black communities and consciously shaping it into brief suites or anthologies called piano rags.

It has sometimes been charged that ragtime is mechanical. For instance, Wilfred Mellers comments, "rags were transferred to the pianola roll and, even if not played by a machine, should be played like a machine, with meticulous precision." (47)However, there is no reason to assume that ragtime is inherently mechanical simply because commercial manufacturers applied a mechanical recording method to it, the only way to record pianos at that date. Ragtime’s is not a mechanical precision, and it is not precision limited to the style of performance. It arises from ragtime’s following a well-defined form and obeying simple rules within that form.

The classic formula for the piano rag disposes three to five themes in sixteen-bar strains, often organized with repeats. (48)The rag opens with a bright, memorable strain or theme, followed by a similar theme, leading to a melody of marked lyrical character, with the structure concluded by a lyrical strain that parallels the rhythmic developments of the earlier themes. The aim of the structure is to rise from one theme to another in a stair-step manner, ending on a note of triumph or exhilaration. Typically, each strain is divided into two 8-bar segments that are essentially alike, so the rhythmic-melodic unit of ragtime is only eight bars of 2/4 measure. (49) Therefore, not concerned with development of musical themes, the ragtime composer instead sets a theme down intact, in finished form, and links it to various related themes that are brief with clear melodic figures. Tension in ragtime compositions arises from a polarity between two basic ingredients: a continuous bass—called by jazz musicians a boom-chick bass--in the pianist’s left hand, and its melodic, syncopated counterpart in the right hand.

Ragtime remains distinct from jazz both as an instrumental style and as a genre. Ragtime style stresses a pattern of repeated rhythms, not the constant inventions and variations of jazz. (50)As a genre, ragtime requires strict attention to structure, not inventiveness or virtuosity, existing as a tradition, a set of conventions, a body of written scores, separate from the individual players associated with it. In this sense ragtime is more akin to folk music of the nineteenth century than to jazz.

(48)The rag opens with a bright, memorable strain or theme, followed by a similar theme, leading to a melody of marked lyrical character, with the structure concluded by a lyrical strain that parallels the rhythmic developments of the earlier themes.