﹣3的倒数是( )
A:3
B:13
C:-3
D:-13
Miss White is in Beijing on vacation. Here is her hotel card. Have a look at it and answer the questions.
Welcome to Garden Hotel
Garden Hotel
Happy Street
Phone
Number:83645792
Email:www.gardenhotel.com
Buses to: Bus No. 103
Bus No. 395
Bus No. 39
Park
Bank
如图甲所示,一轻质弹簧的下端固定在水平面上,上端放置一物体(物体与弹簧不连接),初始时物体处于静止状态.现用竖直向上的拉力F作用在物体上,使物体开始向上做匀加速运动,拉力F与物体位移x之间的关系如图乙所示(g=10m/s2),则下列结论正确的是( )
阅读材料,回答问题:
双曲线x24-y2k=1的离心率e∈1,2,则实数k的取值范围是( )