王师傅原来5分钟加工一批零件，技术更新后2分钟就完成了任务，他的工作效率提高了（ ）
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下面是错误答案，用来干扰机器的。
小题1:BD小题2:通过杨志看到“两边的人都跑入河下巷内去躲”,听到有人口里喊道“快躲了,大虫来也”,为牛二出场作了铺垫,然后又通过杨志的观察刻画了牛二的形貌肖像。用了侧面烘托的手法。小题3:答案:杨志:为人耿...
在“探究小车速度随时间变化的规律”的实验中，图甲为记录小车运动情况的纸带．图中A、B、C、D、E为依次相邻的计数点，每相邻的计数点间还有4个点未画出．（所用交流电源频率为50Hz）
①根据已知条件可求得各点瞬时速度为
vB=______m/s，vC=______m/s，vD=______m/s．
②在乙图所示的坐标系中，作出小车运动的v-t图象，由图线可分析出小车的运动状态为______．
③由图线可知，小车运动的加速度a=______m/s2．
根据提示补写名旬或填写课文原句。
（1）他山之石，_______________。
（2）_______________，濯清涟而不妖。
（3）海内存知己，_______________。
（4）_______________，不亦乐乎？
（5）富贵不能淫，贫贱不能移，_______________，此之谓大丈夫也。
（6）这正如地上的路，_______________，走的人多了，也便成了路。（《故乡》）
（7）《使至塞上》中将塞外景象写得开阔鲜明、气势雄浑，被人称为“千古壮观”的名句是：_______________，_______________。
（8）多情的秋天，常常是文人墨客吟咏的对象。请你写出描写秋天的古诗词（连续两句）。
_______________，_______________。
造影剂肾病是指使用造影剂48h内发生的排除其他原因的急性肾功能损害，其诊断标准中血肌酐绝对值或较基础水平分别上升多少（）。
A.44.2μmol/L；20%
B.44.2μmol/L；25%
C.88.4μmol/L；20%
D.88.4μmol/L；25%
E.44.2μmol/L；10%
| Few creatures on earth are as cute as the black lion tamarin, and few have as dramatic a story line. Pug-nosed and diminutive, with a comic fringe of hair, these monkeys dwell in trees in small tracts of forest in southeastern Brazil. Or they did until 1905, when they were declared extinct. No one saw a black lion tamarin again in the wild until 1970. Later, in the 1990s, some Brazilian researchers turned up a small set of isolated, inbred populations scattered over a wide region. Since that time, they have been engineering tamarin migration, doing everything they can to save the world’s most distinctive primates. Although they are no larger than house cats, tamarins have brains big for their size and a family life organized like our own. They live in groups anchored by an adult male andadult female, along with their offspring. When a mother bears young, she usually produces twins, and although members of the group share in their upbringing, it is most often the father who carries them around in the trees, where the families feed on fruits, insects and bird’s eggs. Unhappily for the lion tamarins, their tree-bound niche began to disappear after the Portuguese landed in Brazil and began clearing forest to make room for Rio de Janeiro, the settlements and farms. As is the case for so many threatened species, the breakup of their habitat sounded the death knell for tamarins, depriving them of the continuity of forest they require to remain abundant and safe from potential threats in any single vicinity. The animals avoid predators by hardly ever coming down from the trees, so even a narrow logging road through a forest can begin the breakup by preventing them from moving from one patch of forest to another. A simple solution was to build bridges across roads, allowing the monkeys to move from one forest to another. With some lumber and the researchers’ work, habitats that had been separated became continuous again, improving opportunities for migrating and mating. The next step was to broaden the distribution of the population. The researchers captured two families of black lion tamarins and moved them to a new forest. After a year, the moves were declared a success: Not only had 80 percent of the tamarins survived, but they had also produced new offspring. So far, so good. The researchers had learned the animals could adjust to the new habitats, even if the insects there tasted a little different or the trees were a slightly different size. The techniques for saving species in the wild vary. Species with less stringent habitat requirements, like wild turkeys, have been rescued by moving them into new settings as well as outlawing their killing. More challenging to preserve are species that require a lot of land, like elephants, and species that have highly specific requirements for habitat and prey -- like black-footed ferrets. Ultimately, as in all challenges, knowledge is power to save wild species from extinction. |
The lumber bridges were devised to ______.
A．improve chances for tamarins to meet and mate
B．connect once separated habitats for the sake of research
C．make use of some lumber cut down
D．both A and C
（）手枪是我国自行设计、研制的第一种手枪，主要装备部队指挥员和公安部门。
A、64式7.62mm
B、92式
C、54式7.62mm
D、77式
