对于非上市公司来说,企业价值最大化的财务管理目标的主要缺点是企业价值的确定比较困难。 ( )
参考答案:对
如图所示,坐标系中第一象限有垂直纸面向外的匀强磁场,磁感应强度B=102 T,同时有竖直向上与y轴同方向的匀强电场,场强大小E1=102 V/m ,第四象限有竖直向上与y轴同方向的匀强电场,场强大小E2=2E1=2×102 V/m。若有一个带正电的微粒,质量m=10-12 kg,电荷量q=10-13 C,以水平与x轴同方向的初速度从坐标轴的P1点射入第四象限,OP1=0.2 m,然后从x轴上的P2点进入第一象限,OP2=0.4 m,接着继续运动.(g=10 m/s2)求:
(1)微粒射入的初速度;
(2)微粒第三次过x轴的位置及从P1开始到第三次过x轴的总时间.
小题1:We ________(听到) him singing in the next room when we passed.
小题2:The tired children don’t get home _________(直到)7 pm.
小题3:While the boy was (争吵) with his sister, their mother came into the room.
小题4:The dog has three legs. How ________(奇怪的) it is!
小题5:Many athletes give money to schools and charities, and do a lot of work to help people.
This is a great ______(机会) that many people do not have.