【2011·江西九江六校第三次联考】D Bruce Alberts, the former President of the National Academies( USA), has now taken over as Editor-in Chief of Science. Judging by his editorial
如图所示，将一负电荷沿电场线方向经A移到B，在此过程中 A．电场力做正功，电势能增加 B．电场力做负功，电势能增加 C．电场力做正功，电势能减
如图所示，在匀速转动的圆筒内壁上，有一物体随圆筒一起转动而未滑动，当圆筒内的角速度增大时，下列各个力中增大的是（ ） A． 重力
As a student，he must spend ________ time on his studies，which is not doubtable. A．less B．few C．ample
粮库内的环境应该是（ ） A、干燥、高温和空气流通的地方 B、潮湿、高温和空气流通的地方 C、 潮湿、低温和空气流通的地方 D、干燥、低温和
I wish you _____ go to the art gallery with us. If there _____ enough tickets, I’d let you know. A. can, were B. could, were C. will, were D. will, is
取一根长度为的绳子，拉直后在任意位置剪断，那么剪得的两段长度都不小于的概率是( ) A. B. C. D．不能确定
Mum my suggestion while Dad spoke my idea. A．turned off, in favour of
的单调递增区间是_______.
