a、b、c、d为短周期元素,原子序数依次增大。25℃时,其最高价氧化物的水化物溶液(浓度均为0.1mol·L-1)的pH和原子序数的关系如图所示。下列有关说法正确的是( ) A.简单离子半径:b>a B.d元素氧化物的水化物一定是强酸 C.气态氢化物的稳定性:d>c D.b、c的简单离子都能破坏水的电离平衡 答案:C
The happy look on his face ________ that he had passed the final examination successfully.
[ ]
A.explained
B.suggested
C.expressed
D.described