一机动车拉一拖车,由静止开始在水平轨道上匀加速前进,在运动开始后的头10s内走过

题型:计算题

问题:

一机动车拉一拖车,由静止开始在水平轨道上匀加速前进,在运动开始后的头10s内走过40m,然后将拖车解脱.但机车的牵引力仍旧不变,再过10s两车相距60m.试求机动车和拖车质量之比.(计算时一切阻力均不计)

考点:牛顿运动定律的应用
题型:计算题

Florence Nightingale was 小题1:b_____ on 12th May, 1820. In 1851 she trained 小题2:a_____ a nurse. Two years 小题3:l_____ she went to a British military hospital so that she 小题4:c_____ help British soldiers. Before she arrived, many soldiers died in the hospital because it was dirty. Nightingale worked 小题5:.h_____ to make the hospital 小题6:c_____ and stop soldiers 小题7:d_____. When she returned to England in 1856, she was a national heroine. Nightingale wrote two books about nursing and she 小题8:a_____ started a school to 小题9:t_____ nurses. She 小题10:d_____ in London on 13th August, 1910, when she was 90 years old.

题型:计算题

已定义以下函数 int fun(int *p) {return *p;} fun函数返回值是______。

A.不确定的值

B.一个整数

C.形参 p 中存放的值

D.形参 p 的地址值

题型:计算题

某中学研究性学习小组拟出一期题为“走进京剧”的墙报。同学们就栏目标题提出四组方案,其中准确的是()

A.乾嘉落户同光扬名民族瑰宝

B.戏曲之祖生旦净丑曲苑奇葩

C.元末初创京城献戏声名鹊起

D.四大徽班康乾京化独领风骚

题型:计算题

《实验动物微生物学等级及监测》规定,小鼠群体小于100只时,取样数量不少于:()

A.只

B.只

C.0只

D.5只

题型:计算题

接触式部件,在接触部位由于接触面小、不洁净或不稳定等原因而产生的对电流的阻力叫()。

A.接触电阻

B.固定电阻

C.可变电阻

D.线性电阻

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