题型:选择题 Where did you pick up news that the pop star, whose new song was quite a hit last year, would give concert?A.tbe;theB.不填;theC.the;aD.不填;a 查看答案
题型:选择题 两分子间的作用力F与间距r的关系图线如图所示,下列说法中正确的是( )A.r<r1时,两分子间的引力为零B.r1<r<r2时,两分子间的作用力随r的增大而逐渐增大C.r=r2时,两分子间的引力最大D.r>r2时,两分子间的引力随r的增大而增大,斥力为零 查看答案