（  ）指的是在采取所有可能的措施或一切必要的法律程序之后，本息仍然无法收回，或只能收回极少部分。

为配制有效氯浓度为500mg/L的消毒剂10L，需要次氯酸钠溶液（有效氯浓度为6.0%）和纯化水的量分别是

硝酸甘油抗心绞痛的作用机制是

遗嘱继承人的范围是（   ）。

根据新《公司法》, 股东提起代表诉讼的原因是（      ）。

1958年Meselson和Stahl利用15N标记大肠杆菌DNA的实验首先证明了下列哪一种机制？（ ）

下列建筑施工企业安全生产许可证违法行为中，应当承担“吊销安全生产许可证”法律责任的违法行为是（     ）。

某大学校园内有两栋建筑高度分别为16m和24m的教学楼相邻，耐火等级均为二级，其中建筑高度为16m的教学楼相邻外墙为防火墙，屋顶无天窗且耐火极限不低于1.0h,建筑高度为24m的教学楼相邻外墙开有外窗，两栋教学楼的防火间距不应小于（   ）m。

类固醇的衍生物是

未经磨耗的年轻恒磨牙咬合面沟嵴清晰，备洞时不易确定洞形的边缘，最理想的龋病治疗方法是（  ）。

Passage 1    A lyric is a subjective poem of intense personal emotion whose principal quality is its musical form. Poe, master of the lyric, was led to explain all poetry as the thythmical creation of beauty in words. Because great poetry is often pure music, haunting melody, and chiming syllables, the reader should not glance through poetry as he read his newspaper or the latest magazine-skipping a word here and a line there, and still hope to get what the author had intended for him. Poetry being music, like all other forms of music, it gains its meaning when interpreted by the human voice.    It is the special function of lyrical poetry to give pleasure through this musical quality no less than through fine contemplation of beauty it inspires-beauty of thought, of feeling, of expression, and of technical skill. But poetry is more than a great pleasure. It should also be an outlet for our own unspoken thoughts and our varied moods. It makes our choked-up passageways of speech, giving adequate expression to our pent-up loves and joys and glories, and fumishes release and relief to our fears, grieves and sorrows. A great poet takes our half-formed thoughts, or suppressed moods, our crushed desires, and needs, and leads them out into the open, endowing them with a harmony, and completeness ...    Great verse can help to vitalize our thinking about the commonplace and elemental in life, and can idealize and give meaning to the simplest things in creation. Listen to Tennyson:    Flower in the crannied wall,    I pluck you out of the crannies,    I hold you here, root and all, in my hand,    Little flower-but if I could understand,    What you are, root and all, and all in all,    I should know what God and man is.
It can be inferred from Tennyson's poem that ______.