Array
(
    [600000] => sh
    [601318] => sh
    [688981] => sh
    [000001] => sz
    [002352] => sz
    [300750] => sz
    [430090] => bj
    [835185] => bj
    [00700] => hk
    [03690] => hk
    [AAPL] => us
    [MSFT] => us
    [BABA.N] => us
    [12345] => hk
    [XYZ123] => unknown
    [SH600000] => unknown
)