搜题请搜索小程序“爱下问搜题”
问题 选择题

一物体作匀加速直线运动，通过一段位移所用的时间为，紧接着通过下一段位移所用时间为。则物体运动的加速度为(  )

A．

B．

C．

D．

答案

答案：A

第一段位移的平均速度为，第二段位移的平均速度为，根据平均速度等于中间时刻的瞬时速度，,加速度为，A对；

听力题

根据下列句子及所给单词的首字母或中文，写出各单词的正确形式(每空限填一词)。

小题1:With exams approaching, I am under a lot of s___________.

小题2:You must make a f____________ plan in case anything happens.

小题3:People can easily become____________ (智力上) addicted to drugs when they start taking them.

小题4:She hopes to get a job on the local newspaper and ____________ (最后) work for The Times.

小题5:An _______(合适) method must be found to deal with such situation.

小题6:Good news! The medicine has a good e______________ on patients.

小题7:My father has q____________ smoking due to its being harmful

小题8:The doors opened____________ (自动地) as we approached.

小题9:He should feel a_____________ of his impolite behavior.

小题10:At the end of each game, players traditionally____________ (交换) shirts with each other.
查看答案
单项选择题

多线化细胞处于永久细胞（）。

A.前期

B.问期

C.中期

D.后期
查看答案