下列反应不可能一步实现的是 A. Na→NaOH B .Al2O3→Al(OH)3 C. Fe→FeSO4 D .Cu→Cu0
已知集合，若，则实数的值为A．1 B． C．1或 D．0、1或
十年春，齐师伐我。公将战。曹刿请见。其乡人曰：“肉食者谋之，又何间焉?”刿曰： “肉食者鄙，未能远谋。”乃入见。问：“何以战?”公曰：“
. 下图表示一个酶促反应，它所能反映酶的一个特性和A、B、C最可能的物质依次是 A．高效性 蛋白酶 蛋白质 多肽 B．专一性 麦芽糖酶 麦芽糖 葡
The country life he was used to________greatly since ㊣1992 A．change B．has changed C．changing D．have changed
It's time you got down to ________ something. A. learn B. do C. see D. reading
She likes to all her free time with her husband． A．take B．spend C．make D．care
As for how to promote public education, Professor Li gave us a lot of suggestions which _____ reasonable and practical. A. appeared B. sounded C. looked D. listened
的前n项和为
且满足
= 。
