表示均数抽样误差大小的统计指标是（） A.标准差 B.方差 C.均数标准误 发布时间：2017-05-06 00:04 │ 来源：www.tikuol.com 题型：单项选择题 A1/A2型题 问题： 表示均数抽样误差大小的统计指标是（）A.标准差 B.方差 C.均数标准误 D.变异系数 E.样本标准误
题型：单项选择题 A1/A2型题 Directions: For each blank in the following passage there are four words or phrases marked A. B. C. and D. Fill in each blank with the word or phrase that best fits the context. This is a true story that happened in Japan. In order to repair a house with a history of 10 years, someonein Japan tore open the walls (Japanese houses normally have a hollow space between the wooden walls.) While painting the walls, he found that there was a lizard 1 there because a nail from outside had beenhammered into one of its feet. Seeing this, he felt pity and at the same time 2 . When he checked the nail, he found it was nailed 10 years ago when the house was first built. What happened? The lizard had survived in such a 3 for 10 years-in a dark wall partition for 10 years without moving! It was incredible. He wondered how this lizard had survived for 10 years without moving a single step-since its foot was nailed! So, he stopped his work and 4 the lizard: what has it been doing and what has it been 5 . Later, hedidn't know from where 6 lizard appeared, with food in its mouth… AHHH! He was astonished and toucheddeeply. The lizard that was stuck by the nail had been fed by this 7 lizard. Just imagine it had been doingthis for 10 tiresome years, 8 giving up hope for its partner! Before hearing the story, I watched a program on a father who kept digging in the ruins caused by an earthquake for 38 hours before finding his son, despite the dangers of fires and aftershocks. He talked abouthis 9 to his son: No matter what happens, I'll always be there for you! What beautiful love that occurred between both humans and such 10 creatures as lizards! The relationshipbetween the two lizards remains unknown, 11 no matter what it is, the love between them has done a 12 . So never abandon your loved ones. ( )1. A. show ( )2. A. angry ( )3. A. wall ( )4. A. observed ( )5. A. living on ( )6. A. other ( )7. A. able ( )8. A. before ( )9. A. suggestion ( )10. A. clever ( )11. A. but ( )12. A. joke B. hidden B. satisfied B. room B. helped B. working on B. any B. free B. after B. lesson B. strange B. though B. warning C. stuck C. worried C. position C. followed C. playing with C. more C. busy C. with C. promise C. tiny C. and C. wonder D. killed D. curious D. roof D. kept D. finding out D. another D. dull D. without D. requirement D. terrible D. for D. mistake 查看答案
题型：单项选择题 A1/A2型题 羟基蒽醌类化合物遇碱颜色改变或加深的反应称为（）A．Feigl反应B．无色亚甲蓝显色试验C．Keller-Killia反应D．Borntrager’s反应E．与金属离子的络合反应 查看答案