querySZLatest = function querySZLatest(){

    async.waterfall([getQueryLatestOption, querySZ], err => {
        if(!err) { console.log('SZ Query Done!'); }
    });
}
Query top buy/sell value of insider tradings
@param {String} type Query type: BV--BuyValue,SV--SellValue
@return {Promise} A promise object of top trading list