某氯化钙样品中可能混有氯化铁,氯化镁,氯化钠和碳酸钠中的某些物质,取样品11.1

题型:选择题

问题:

某氯化钙样品中可能混有氯化铁,氯化镁,氯化钠和碳酸钠中的某些物质,取样品11.1g溶于适量水中,得到澄清的无色溶液,然后向其中加入足量的硝酸银溶液,得到29.7g白色沉淀,则该样品组成中一定含有的是(   )

A.碳酸钠

B.氯化镁

C.氯化钠

D.氯化铁

考点:物质的量
题型:选择题

Visual FoxPro的报表文件.FRX中保存的是______。

A.打印报表的预览格式

B.打印报表本身

C.报表的格式和数据

D.报表设计格式的定义

题型:选择题

选出下列画线词语意思不同的两项[ ]

A.辍耕垄上——又间令吴广次所旁从祠中

B.扶苏以谏故,上使外将兵——骑千余,卒万人

C.大王尝闻布衣之怒夫——臣本布衣,躬耕于南阳

D.卜者知其意——皆目陈胜

题型:选择题

测评标准体系的纵向结构一般包括( )。

A.测评内容

B.测评目标

C.测评指标

D.测评要求

E.测评标准

题型:选择题

"The language of a composer", Cardus wrote, "his harmonies, rhythms, melodies, colors and texture, cannot be separated except by pedantic analysis from the mind and sensibility of the artist who happens to be expressing himself through them".
But that is precisely the trouble; for as far as I can see, Mozart’s can. Mozart makes me begin to see ghosts, or at the very least ouija-boards. If you read Beethoven’s letters, you feel that you are at the heart of a tempest, a whirlwind, a furnace; and so you should, because you are. If you read Wagner’s, you feel that you have been run over by a tank, and that, too, is an appropriate response.
But if you read Mozart’s—and he was a hugely prolific letter-writer—you have no clue at all to the power that drove him and the music it squeezed out of him in such profusion that death alone could stop it; they reveal nothing—nothing that explains it. Of course it is absurd(though the mistake is frequently made)to seek external causes for particular works of music; but with Mozart it is also absurd, or at any rate useless, to seek for internal ones either. Mozart was an instrument. But who was playing it
That is what I mean by the Mozart Problem and the anxiety it causes me. In all art, in anything, there is nothing like the perfection of Mozart, nothing to compare with the range of feeling he explores, nothing to equal the contrast between the simplicity of the materials and the complexity and effect of his use of them. The piano concertos themselves exhibit these truths at their most intense; he was a greater master of this form than of the symphony itself, and to hear every one of them, in the astounding abundance of genius they provide, played as I have so recently heard them played, is to be brought face to face with a mystery which, if we could solve it, would solve the mystery of life itself.
We can see Mozart, from infant prodigy to unmarked grave. We know what he did, what he wrote, what he felt, whom he loved, where he went, what he died of. We pile up such knowledge as a child does bricks; and then we hear the little tripping rondo tune of the last concerto—and the bricks collapse; all our knowledge is useless to explain a single bar of it. It is almost enough to make me believe in — but I have run out of space, and don’t have to say it. Put K. 595 on the gramophone and say it for me.

The "Mozart problem", as defined by the author, is that ______ .

A.it is difficult to understand Mozart’s letters and his music

B.there is little connection between his personality and his music

C.Mozart gave us nothing of a clue about his music in his letters

D.his music is quite different from that of Beethoven or Wagner

题型:选择题

HDLC的物理通路是()是交换网络的母线,带宽为2Mbit/s,交换机中用来传送所需的交换信息如:话音、信令等。

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