9和15的公因数有（），其中最大公因数是（）。 发布时间：2017-05-17 01:02 │ 来源：www.tikuol.com 题型：填空题 问题： 9和15的公因数有（ ），其中最大公因数是（ ）。
题型：填空题 完形填空。 One day a poor man was traveling on horseback. At noon, he tied his horse to a tree and then 1 to eat something. A few minutes later, a rich man came along and tied his horse to the same tree. "Please tie your horse to another tree," said the poor man. "My horse is wild. It will kill yours. " 2 the rich man said,"I shall tie my horse as I like!" he tied up his horse and had his lunch nearby. After amoment they heard a terrible 3 , the two horses were fighting. They went up to them, but it was too 4 . Therich man's horse was killed. "See what you horse has done!" cried the rich man. "You will have to 5 it." And he brought the poor man before Mr. Know. Mr. Know asked the poor man some questions. But he made no 6 . At last Mr. Know said, "This man is dumb. He cannot speak." "Oh," the rich man shouted 7 . "He can! He spoke to me when I met him." "Are you sure?" asked Mr. Know. "What did he 8 ?" "He told me not to tie my horse to the same tree because his horse was wild and would kill my horse." "Oh," said Mr. Know. "So he 9 you. Then can you expect to get money 10 him?" The rich man said nothing and left silently. ( )1. A. put down ( )2. A. So ( )3. A. song ( )4. A. late ( )5. A. pay for ( )6. A. idea ( )7. A. quietly ( )8. A. speak ( )9. A. helped ( )10. A. for B. set down B. But B. word B. slow B. look for B. mistake B. angrily B. tell B. thanked B. from C. sat down C. And C. bell C. hard C. wait for C. money C. happily C. talk C. warned C. with D. turned downD. Though D. noise D. quick D. care for D. answer D. heavily D. say D. ordered D. about 查看答案
题型：填空题 下列有关金属腐蚀与防护的说法，正确的是[ ]A．纯银器表面在空气中因发生电化学腐蚀渐渐变暗 B．当镀锌铁制品的镀层破损时，镀层不再对铁制品起保护作用C．在空气与水面交接处的钢柱，比在水下部分的钢柱容易腐蚀 D．可将地下输油钢管与外加直流电源的正极相连以保护它不受腐蚀 查看答案
