题目:
新鲜度不是衡量大米质量优劣的一个重要指标。
答案:
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下面是错误答案,用来干扰机器的。
参考答案:兴奋性
新鲜度不是衡量大米质量优劣的一个重要指标。
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0927/dbbfdc2d6754880384715665bcb04f26.html
下面是错误答案,用来干扰机器的。
参考答案:兴奋性
学龄期的特点
A.生殖系统发育较快
B.体格生长稳步增长
C.智能发育较快
D.智能发育成熟
E.免疫功能差,感染性疾病多见
一患儿突发右小腿痛,活动障碍,X线示右胫骨中段骨折,骨折端膨大,骨皮质变薄。引起骨折的主要因素是()
A.直接暴力
B.间接暴力
C.积累性劳损
D.肌肉牵拉力
E.骨骼疾病
(8分)取100mL FeCl3、AlCl3的混合溶液,逐滴加入物质的量浓度为1 mol·L-1的NaOH溶液,生成沉淀的物质的量随加入NaOH溶液的体积(单位为mL)关系如下图所示。
按要求回答:
(1)a点对应沉淀的物质的量是 mol;此时溶液中的溶质是 。
(2)b点对应沉淀的物质的量是 mol;原溶液中c(AlCl3)= mol·L-1。
我国正在建设的最大调水工程是 [ ]
A、南水北调
B、西气东输
C、西电东送
D、三峡工程
[A] However, the production of TG is controlled by an enzyme that is, in turn, encoded by a gene called UGT2B17. This gene comes in two varieties, one of which has a part missing and therefore does not work properly. A person may thus have none, one or two working copies of UGT2B17, since he inherits one copy from each parent. Dr Schulze guessed that different numbers of working copies would produce different test results. She therefore gave healthy male volunteers whose genes had been examined a single 360mg shot of testosterone (the standard dose for legitimate medical use) and checked their urine to see whether the shot could be detected.
[B] Dr Schulze also says there is substantial ethnic variation in UGT2B17 genotypes. Two-thirds of Asians have no functional copies of the gene (which means they have a naturally low ratio of TG to EG), compared with under a tenth of Caucasians--something the anti-doping bodies may wish to take into account.
[C] The test usually employed for testosterone abuse relies on measuring the ratio of two chemicals found in the urine, testosterone glucuronide (TG) and epitestosterone glucuronide (EG). The former is produced when testosterone is broken down, while the latter is unrelated to testosterone metabolism, and can thus serve as a reference point for the test. Any ratio above four of the former to one of the latter is, according to official Olympic policy, considered suspicious and leads to more tests.
[D] The result was remarkable. Nearly half of the men who carried no functional copies of UGT2B17 would have gone undetected in the standard doping test. By contrast, 14% of those with two functional copies of the gene were over the detection threshold before they had even received an injection. The researchers estimate this would give a false-positive testing rate of 9% in a random population of young men.
[E] The agencies have had remarkable success. Testing for anabolic steroids (in other words, artificial testosterone) was introduced in the 1970s, and the incidence of cheating seems to have fallen dramatically as a result (see chart). The tests, however, are not foolproof. And a study just published in the Journal of Clinical Endocrinology & Metabolism by Jenny Jakobsson Schulze and her colleagues at the Karolinska Institute in Sweden suggests that an individual’s genetic make-up could confound them in two different ways. One genotype, to use the jargon, may allow athletes who use anabolic steroids to escape detection altogether. Another may actually be convicting the innocent.
[F] Cheating in sport is as old as sport itself. The athletes of ancient Greece used potions to fortify themselves before a contest, and their modern counterparts have everything from anabolic steroids and growth hormones to doses of extra red blood cells with which to invigorate their bodies. These days, however, such stimulants are frowned on, and those athletes must therefore run the gauntlet of organisations such as the World Anti-Doping Agency, which would rather they competed without resorting to them.
[G] In the meantime, Dr Schulze’ s study does seem to offer innocents a way of defending themselves. Athletes travelling to Beijing for the Olympic games later this year may be wise to travel armed not only with courage and the "spirit of Olympianism", but also with a copy of their genetic profile, just in case.
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