苏格拉底说:“没有人愿意用抽签的方法去雇佣一位舵手、建筑师、吹笛手或其他行业的人,而这类事若出错的话,危害还比在管理国家事务上出错轻
如图所示,两根水平放置的相互平行的金属导轨ab、cd,表面光滑,处在竖直向上的匀强磁场中,金属棒PQ垂直导轨放在上面,以速度v向右匀速运动.欲使棒PQ停
What the remote areas need ____ education to children and what the children need ____ good textbooks at the moment. A.is; are B.are; is C.was; were
服装店销售某款服装,一件服装的标价为300元,若按标价的八折销售,仍可获利60元,则这款服装每件的标价比进价多( ) A. 180元 B.120
已知lgx = a,lgy = b,lgz = c,且有a+b+c = 0,求x·y·x的值.
已知复数z及z1=3+2i,复数z满足zz1=3z+z1,则复数z=________.
实验室中需要配制2mol/L的NaOH溶液950 mL,配制时应选用的容量瓶的规格和称量的NaOH的质量分别是( ) A.950 m L,76.0 g B.500 m L,80.0 g C.
--- Do you know _____ there is a post office around here? --- Yes, it’s on the Second Street. A. where B. if C. that