①既有离子键又有共价键的是____.
②熔化时不需要破坏化学键的是____;熔化时需要破坏共价键的是____.
③CO2的电子式为____;A、B、D的熔点依次增大的顺序为____.
关于柳永说法不正确的是?( )
He hurried to the station only _______ that the train had left.