(4分)摩擦起电以及其他大量事实表明:电荷既不能 ,也不能 ,它们只能从一个物体转移到另一个物体,或者
E The question of what children learn, and how they should learn it, is continually being debated and redebated. Nobody dares any longer to defend the old system, the parrot-fashion (way
22.第三段中①-③的文字(加“ ”)有一处语病,请写出序号并加以修改。(2分) (1)有语病的一处的序号: (1分) (2)修改:
A quarter of today’s UK children are living in families which cause more than one risk to their educational development, a study says. Institute of Education researchers analyzed 10 risk f
请回答以下问题: (1)番茄植株缺镁会出现叶片发黄和植株矮小的症状,主要原因是 ______________________________________________________ ___________________________________
已知数列的前项和(是不为的实数),那么( ) A.一定是等差数列 B.一定是等比数列 C.或者是等差数列,或者是等比数列