Chi结构

A . 正确 B . 错误

A . 含水污染物i的排放浓度 B . 评价河段含水污染物i的浓度 C . 含水污染物i的地表水水质标准 D . 含水污染物i的废水排放量

A . stu B . eng C . tea D . chi

A . ACAT B . LCAT C . 肝脂酶 D . 胰脂酶 E . 脂蛋白脂肪酶

A . 正确 B . 错误

A . A．是双链经常断裂的部位，可诱导重组 B . B．是单链经常断裂的部位，导致单链同化作用 C . C．是RecBCD复合物作用的位点，在这些位点，受双链断裂激活的RecBCD复合物切开一个自由3′-OH端 D . D．是顺式作用元件，在该元件内可以产生一个单链的自由3′-OH端 E . E．是RecA蛋白结合的DNA位点，RecA蛋白从该点沿着DNA移动直到断裂点

A . 闭合 B . 打开 C . 串接10K电阻 D . 串接2.2K电阻

A . 正确 B . 错误

A．A.00 B．B.12 C．C.18 D．D.99

Children have been said to have brain-injured child syndrome, hyperactive (极度活跃的) child syndrome and attention-deficit disorder (ADD). As early as the 1940's, psychiatrists have【62】children with hyperactivity and extremely distracted and impulsive. These frequent name changes show how【63】researchers are about the causes of the problem and the diagnostic (诊断的)【64】for the disorders. In the past several years, the people who study attention deficit hyperactivity disorder (ADHD) have【65】to clarify the disorder's causes and【66】, and have reasons to believe that it may be【67】. Today's view on this disorder is very different from the beliefs of just a few years ago. Researchers are finding that ADHD is not a disorder of just attention, but is from a developmental【68】in the brain's circuitry and self-control. The loss of self-control【69】other important brain functions compulsory for【70】attention. ADHD【71】two sets of symptoms: inattention and a【72】of hyperactive and impulsive behaviors. Most children are more active and【73】than adults are. Children are more inconsistent,【74】by brief actions. The younger the child, the【75】aware they are. This behavior. is a【76】of a problem when it is displayed more in them than in their【77】. Boys are at least three times more【78】than girls to have ADHD. Studies have found that ADHD in boys outnumbers girls 9 to 1; this is because boys are genetically likely to develop disorders in the nervous system. These behaviors【79】occur between the ages of 3 and 5.【80】, some children don't start to develop the disorder until late childhood or early adolescence. Researchers are unable to find the reasons for this【81】. (63) A．formulated B．labeled C．patented D．licensed

A．0 B．361N C．375kN D．375N

A．T＞5或n＜40 B．r＜1且n＞40 C．T＜1或n＜40 D．1＜T＜5且n＞40 E．T＞5且n＜40