（）将屋面板搁放在有一定倾斜度的梁或墙上，而形成屋面坡度。A、构造找坡B、材料找坡C

下列关于个人独资企业和合伙企业投资者个人所得税申报表中项目的说法，不正确的是( )。

A．“超过规定标准扣除的项目”是指企业超过《个人独资企业投资者征收个人所得税的规定》和其他有关税收规定(以下简称规定)的扣除标准

B．“不允许扣除的项目”是指规定不允许扣除、但企业已将其扣除的各项成本、费用和损失，应予调增应纳税所得额的部分

C．“弥补亏损”是指企业根据规定，以前年度亏损允许在税前弥补而相应调增的应纳所得额

D．“投资者标准费用扣除额”是指省、自治区、直辖市地方税务局规定允许扣除的投资者个人的费用扣除数额

合理密植每公顷保苗（）万株。

蛋白质变性是由于（）

A.氨基酸的组成改变

B.氨基酸的排列顺序改变

C.肽键的断裂

D.蛋白质空间结构被破坏

声波检测仪应符合那些技术性能？

It is hard to predict how science is going to turn out, and if it is really good science it is impossible to predict. If the things to be found are actually new, they are by definition unknown in advance. You cannot make choices in this matter. (46) You either have science or you don’t, and if you have it you are obliged to accept the surprising and disturbing pieces of information, along with the neat and promptly useful bits.
The only solid piece of scientific truth about which I feel totally confident is that we are profoundly ignorant about nature. Indeed, I regard this as the major discovery of the past hundred years of biology. It is, in its way, an illuminating piece of news. (47) It would have amazed the brightest minds of the 18th century Enlightenment to be told by any of us how little we know and how bewildering the way ahead seems. (48) It is this sudden confrontation with the depth and scope of ignorance that’ represents the most significant contribution of the 20th century science to the human intellect. In earlier times, we either pretended to understand how things worked or ignored the problem, or simply made up stories to fill the gaps. Now that we have begun exploring in earnest, we are getting glimpses of how huge the questions are, and how far from being answered. Because of this, we are depressed. (49) It is not so bad being ignorant if you are totally ignorant the hard thing is knowing in some detail the reality of ignorance, the worst spots and here and there the not so bad spots, but no true light at the end of the tunnel nor even any tunnels that can yet be trusted.
But we are making a beginning and there ought to be some satisfaction. There are probably no questions we can think up that can’t be answered, sooner or later, including even the matter of consciousness. (50) To be sure, there may well be questions we can’t think up, ever, and therefore limits to the reach of human intellect, but that is another matter. Within our limits, we should be able to work our way through to all our answers if we keep at it long enough, and pay attention.