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简述学习动机与学习需要和诱因之间的关系。
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【简答题】固相化合物的合 成反应中,其反应速度与产物层的厚度成反比,为缩短反应时间,通常将阳离子制成 ,这种方法也叫做 合成法。
【简答题】用所给单词的适当形式填空。 1. The supermarket _____ (be) open at 9:00 in the morning. 2. Tom enjoys _____ ( read) short stories to children. 3. Li Lei gets to school _____ (one) every day. 4. How many _____ (lion)...
【简答题】Complete the following sentences with proper prepositions or adverbs. (每空 2 分 ,共计 20 分 ) 1. A lion escaped _____ its cage at the National Zoo last night. 2. World leaders are now united _____ their qu...
【简答题】看图，把下面文章补充完整。把方框中单词序号填入文中正确位置，并判断所给句子的正(√)误(×)。加油啊！ a. leaves b. bananas c.meat d. elephant e. camel f. monkey g. giraffe h. lion i. river j. tree Jenny and Danny go to the zoo.Jenny sees an...
【简答题】Questionsare based on the following passage. When you think about the growth of human population over the last century or so， it is alltoo easy to imagine it merely as an increase in the number of hum...
【简答题】氮是地球上含量丰富的一种元素，氮及其化合物在工农业生产、生活中有着重要作用。 （1）在固定容积的密闭容器中，进行如下化学反应：N 2 （g）+3H 2 （g） 2NH 3 （g） △H=—92．4kJ/mol， 其平衡常数K与温度T的关系如下表： T/K 298 398 498 平衡常数K 4.1×10 6 K 1 K 2 试判断K 1 K 2 （填写“>” “ =”或“（2）用2mol N 2 ...
【简答题】看图，根据首字母的提示，完成句中单词所缺的字母。 1. There are many t___________ in our parks. 2. The mouse began to b___________ the net and saved the lion at last. 3. Guangzhou is f___________ ___________ from Beijing. 4. T...
【简答题】In the past 300 years, more than 130 species of animals have become extinct . One of these extinct species is the passenger pigeon(旅鸽). At one time there were millions of these birds in North America,...
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