现有E、F、H、I、G、K六种原子序数依次增大的前四周期主族元素,且分属四个不同周期,E、G同主族,F、H、I为同周期相邻的三种元素,其中F元素形成
已知函数,则使方程有解的实数的取值范围是( ) A.(1,2) B. C. D.
Last month, our English Department invited a local radio star to a public lecture on the topic of media influence on society. A. communicate B. demand
下列说法正确的是( ) A.将河水经过沉淀、过滤、活性炭吸附等净化处理后,所得的水就是纯水 B.用肥皂水不可以区分硬水和软水
人生的真正价值是:( ) A.吃好、喝好、住好、玩好、乐好 B.获得社会的尊重和满足 C.对社会尽责任、作贡献 D.实现自己的梦想
完形填空 Today is Saturday,Ann _1____ to school.Her parents Mr King and Mrs King _2___ to work.They want to go to the Haishan Park.The park is near their house,so they 3____ to the park.It’s 9
The police say there is a $50,000 _______ for any information that helps them find the killer. A. income B. fee C.
某班级要从5名男生和2名女生中选出3人参加公益活动,则在选出的3人中男、女生均有的概率为 (结果用最简分数表示)