函数的图像均过点                         （ ）

下列排序正确的是（ ）
①热稳定性：H₂O>HF>H₂S                      ②原子半径：Na>Mg>O
③酸性：H₃PO₄>H₂SO₄>HCl   O₄             ④结合H⁺的能力：OH^—>CH₃COO^—>Cl^—

如图所示，因线路故障，按通K时，灯L₁和L₂均不亮，用电压表测得U_ab=0，U_bc=0，U_cd=4V．由此可知出现故障处为（   ）

     Tom and Mike are good friends. They are good with children. They want to find jobs in summer vacation. This Friday Tom tells Mike that Sunson School Trip needs teachers to help with sports, music and computer. Mike is glad to know that.
    Tom can play basketball, volleyball, and he can swim. Mike can play the violin, the trumpet, the drums and the guitar, and he can swim,too. Tom and Mike like computers very much. Can they join Sunson School Trip?

朗读节奏停顿错误的一项是（    ）