交换性阳离子
参考答案:
能互相交换的阳离子就称为交换性阳离子。
When I handed the form to John, he said that Smith would be the best person ______.
A.to send
B.for sending it
C.to send it to
D.for sending it to
淘宝网账户一旦注册不得修改,因此创业者要在注册时仔细斟酌,取好淘宝账户名。