作变速直线运动的物体，若前一半时间的平均速度为8m/s，后一半时间的平均速度是1 发布时间：2017-04-24 13:32 │ 来源：www.tikuol.com 题型：选择题 问题： 作变速直线运动的物体，若前一半时间的平均速度为8m/s，后一半时间的平均速度是16m/s，则全程的平均速度是（ ）A．14 m/sB．10 m/sC．11 m/sD．12 m/s
题型：选择题 完形填空。 Billy is a boy of fifteen. His parents died three years ago. One day when he was walking in the street, he 1 a wallet (钱包). He returned it to the owner, Mr. Baker. He gave his 2 to the boy. As the boyhad no job, Mr. Baker made him work for him in his 3 . Billy worked so hard that Mr. Baker were 4 with him. Mr. Baker loved planting 5 . The week before last, he brought a few trees home, planted them in the 6 himself and watered them every day. Several days 7 , he had to leave for another city. Beforehe started, he said to Billy,"Take good care of the trees. Some boys near our house always want to stealthem." "Please don't 8 about them, sir." answered Billy, "I'll try my best to watch them." Six days passedand Mr. Baker came back. He asked,"Has 9 ever come to steal the trees?" "No, sir." said Billy, "To stopsomeone from stealing the trees, I 10 them up six days ago. I have hidden them for almost a week!" ( )1. A. found ( )2. A. wallet ( )3. A. factory ( )4. A. pleased ( )5. A. flower ( )6. A. garden ( )7. A. ago ( )8. A. think ( )9. A. something ( )10. A. sent B. bought B. pity B. office B. angry B. grass B. office B. later B. talk B. one B. pulled C. carried C. thanks C. town C. strict C. vegetables C. city C. before C. learn C. anyone C. put D. wanted D. excuses D. home D. popular D. trees D. room D. after D. worry D. someone D. picked 查看答案
题型：选择题 下列不属于设计委托阶段设计管理内容的是( )。A．评审初拟勘察设计工作大纲和设计工作方案B．签订工程勘察设计合同C．组织审查初步设计大纲和勘察大纲D．直接选择或招标选定工程设计单位 查看答案