短周期元素A、B、C、D的原子序数依次增大，原子半径r（C）＞r（D）＞r（B）＞r（A）．B原子最外层电子数是其内层电子总数的3倍，D原子的核电荷数等
下表中，有关量的变化图像与其对应叙述相符的是( ) AB 向接近饱和的NaCl溶液中加入固体NaCl向等质量、等质量分数的两份稀盐酸中分别加入足量的Z
TimetableEvery Sunday I take the first bus to the park. There can play some sports. After that, I must go to the market. I want to do some shopping there. The market opens from se
Not until ___ on TV ___ that the Chinese was rescued by the European Union Task Force. A. did I turn; did I know B. did I turn; I knew C. I turned; did I know
（09嘉兴一中二月）在一个DNA分子中，腺嘌呤与胸腺嘧啶之和占全部碱基数目的54％，其中一条链中鸟嘌呤与胸腺嘧啶分别占该链碱基总数的22％和28％，
---Did you reach the top of the mountain? ---Yes．Even I myself didn’t believe I could ______ it． A．work B．climb C．make D．g
下列句子中，加点的成语使用恰当的一项是（3分） （ ） A．这种全方位的恶性竞争，只可能产生彻底的赢家
的单调递增区间为____________。
