【简答题】已知数列{a n }和{b n }的通项公式分别为a n =3n+6，b n =2n+7（n∈N*），将集合{x|x=a n ，n∈N*}∪{x|x=b n ，n∈N*}中的元素从小到大依次排列，构成数列c 1 ，c 2 ，c 3 ，…c n 。 （1）c 1 ，c 2 ，c 3 ，c n ； （2）求证：在数列{c n }中，但不在数列{b n }中的项恰为a 2 ，a 4 ，…a 2n ，…；...

【简答题】We are up for lost time.

【简答题】在集合A＝{2,3}中随机取一个元素m，在集合B＝{1,2,3}中随机取一个元素n，得到点P(m，n)，则点P在圆x 2 ＋y 2 ＝9内部的概率为________．

【判断题】Hadoop需要购买后才能安装使用。

【单选题】形体被剖切后形成的断面轮廓线,用( )画出。

【简答题】Around the world smart cities are being built while those we have lived in for centuries are being upgraded for the future. A smart city may mean one that uses data on traffic to ease congestion or on...

【单选题】在破坏小白鼠一侧小脑时,刺入颅骨的深度不宜超过()。

【简答题】A professor is of the college who has , usually a PhD or what we call a terminal degree, in their field. The professors are responsible for , , sure that the major requirements are always curre...

【简答题】It ’ s no secret that some of the resolutions that many of us vowed to pursue in the new year — eat healthy, lose weight, quit smoking, save more money — have already fallen by the wayside. Many of th...

【单选题】Saying sorry shows that we are sincere about for what we've done. [     ]