已知等比数列中,若,则该数列的前2011项的积为 ( ) A. B. C. D.
某物体以30 m/s的初速度竖直上抛,不计空气阻力,g取10 m/s 2 ,则4s内物体的( ) A.路程为65 m B.位移大小为25 m,方向向上 C.速
(10分)如图所示的电路中,三个电阻阻值均为r,电源内阻不计。两金属板问的距离为d,当开关k闭合时,一质量为m、电量为q的带电油滴从高处由静止
完形填空: Every year on my birthday, from the time I turned twelve, a white gardenia(栀子花) was delivered to my house. No card or note came with it. 36 to the flower shop were always
用铜、铁、铝三种不同的物质构成的质量相等的实心球体,体积最大的是:(ρ铜>ρ铁>ρ铝)A. 铁球; B. 铜球; C.
You'd better carry a(n) tyre in the back of your car in case it breaks down on the way. A. extra B. free C. convenient D. s
全国人大与国务院的关系是() A.监督与被监督的关系 B.平等协商的关系 C.立法与执法的关系 D.互相制约的关系