【单选题】若m是2和8的等比中项,则圆锥曲线x 2 + y 2 m =1 的离心率为( )
【单选题】? Look at questions 1-5. ? In each question, which sentence is correct? ? For each question, mark one letter (A, B or C) on your Answer Sheet. Present this card to receive 10% off purchase in the Visi...
A.
Visitors can get a 10 % discount with this card.
B.
Visitors can get 10% of the selling items in the bookstore.
C.
Visitors need to pay only 10% of the price for the books bought.
【单选题】?Look at questions 1-5. ?In each question, which sentence is correct? ?For each question, mark one letter (A, B or C) on your Answer Sheet. Perfect for transporting computers, audio visual equipment a...
A.
It is a perfect way of transportation.
B.
It is ideal for moving valuable equipment.
C.
It can be used to transfer home appliances.
【简答题】在等差数列 和等比数列 中,a 1 =2, 2b 1 =2, b 6 =32, 的前20项和S 20 =230. (Ⅰ)求 和 ; (Ⅱ)现分别从 和 的前4中各随机抽取一项,写出相应的基本事件,并求所取两项中,满足a n >b n 的概率.
【判断题】在看到道德具有重大作用的同时,也必须看到道德发挥作用的性质并不都是一样。
【单选题】The question of whether war is inevitable is one which has concerned many of the world's great writers. Before considering this question,【B1】will be useful to introduce some【B2】concepts. Conflict,【B3】...
【简答题】在等差数列 和等比数列 中,a 1 =2b 1 =2,b 6 =32, 的前20项 和S 20 =230. (Ⅰ)求 和 ; (Ⅱ)现分别从 和 的前4中各随机抽取一项,写出相应的基本事件,并求所取两项中,满足a n >b n 的概率.