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【简答题】
The sizzling streams of sunlight were just beautifully glimmering down on the crisp green schoolyard. Such a wonderful day that was. Nothing could have ruined it. Little Jimmy, since it was such a wonderful day, decided to go to the comer store and buy himself a little treat. As Jimmy started walking over to the store, clouds flocked over the dazzling sun and the sudden pitch dark meant no trouble. On the other side of the road were three white boys from the same school of Jimmy's. Upon recognizing Jimmy, the boys ran over the street to where he was. “Hey Negro, what's up?” one of the white boys said. “Did your mamma pack you enough to cat today?" “Just shove off and let me be,” Jimmy answered. It is like this everyday, everywhere, and every time; people suffer discrimination. All because they are diferent from each other. Different beliefs, diferent cultures, different skin colors, all of these act like building blocks to help construct what we know as racism. Racism has become one of the many burdens amongst multi-cultural worlds like Canada and the States. Racism is part of each and every one of us. No doubt, we are all racist, but the term racism has been used too loosely. Racism has been changed to such an exten that it could be a reason for war, a symbol of terrorism, and even an excuse for neglecting. Is that all there is to in? No, actually it is just the beginning. Racism is just like warfare in which there is no shelter and nobody is neutral. Nobody is exempt from this demon. He has haunted us with a bitter curse. On one occasion I remember, nobody would play with me at school. I would walk around by myself and ask people if we could play together. Wherever I went, like the process of induction, everyone would avoid me, like two inducted poles with the same polarity, and they would just shimmer off into the distance and continue to do whatever they 're doing. Because of racial differences, they neglected me. People are afraid of the unknown, and it is this difference amongst people that spreads rumors and distrust. Corupted in our thoughts and reasons, we get accustomed to thinking differences. For smaller kids, there is no difficulty in getting them all to play together. Their thoughts are not totally corrupted as others. Probably the demon has no time to bother with smaller children.
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【简答题】核酸两性是因为有酸性的 和碱性的
【单选题】局域网常用的拓扑结构有星型、环形和()
A.
总线型
B.
不规则型
C.
组织型
D.
花型
【单选题】施工图审核是指监理工程师对施工图的审核,审核的重点是( )。
A.
使用功能及质量要求是否得到满足
B.
建筑造型与立面设计
C.
平面、空间设计
D.
工艺流程设计
【单选题】监理工程师对施工图审核的重点是( )。
A.
投资是否得到满足
B.
进度是否得到满足
C.
使用功能及质量要求是否得到满足
D.
是否满足施工单位的施工技术要求
【简答题】( ) 通常是指间接作用在建筑结构上的各种力。
【单选题】最能解释溶菌酶在 pH7.0 比在 pH5.0 的催化活性慢 10 倍以上的原因是 注: 溶菌酶的活性中心有两个关键的AA,Asp和Glu, 其中Asp能诱导底物的构象改变转换为过渡态,Glu起广义的酸碱催化作用。 Glu 的α - 羧基的 pKa 为 2.19 ,γ - 羧基的 pKa 为 4.25; Asp 的α - 羧基的 pKa 为 2.09 , β - 羧基的 pKa 为 3.86 。
A.
一个在反应中充当亲核试剂的 His 残基在 pH7.0 处于错误的质子化状态
B.
一个通过静电作用起稳定过渡态的 Asp 残基在 pH7.0 处于错误的质子化状态
C.
底物在 pH7.0 不能再与酶结合
D.
一个质子化离开基团的 Glu 残基在 pH7.0 不能再作为广义酸起作用
【判断题】建筑荷载通常是指间接作用在建筑结构上的各种力,也称为间接作用荷载。
A.
正确
B.
错误
【单选题】局域网常用的拓扑结构有星型、环型和( )型.
A.
总线型
B.
不规则型
C.
树型
D.
网状型
【单选题】施工图审核是指监理工程师对施工图的审核,审核的重点是( )是否得到满足。
A.
设计深度
B.
质量要求
C.
设计内容
D.
使用功能及质量要求
【单选题】核酸的变性是指碱基对之间的氢键断裂,双螺旋结构分幵,成为两股单链的DNA分子。让核酸变性的因素可以是加热、加酸、加碱或者乙醇有机溶剂等。变性后的DNA生物学活性丧失,在260nm处的光吸收值升高。与变性相关的概念是DNA的Tm值,它是指( )
A.
双螺旋DNA达到完全变性时的温度
B.
双螺旋DNA达到开始变性时的温度
C.
双螺旋DNA结构失去1/2时的温度
D.
双螺旋DNA结构失去1/4时的温度
E.
都不对
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