【A函数-账户交易】账号正常A_GetCommissionRate返回False

调用获取模拟模拟账户下rb2605的手续费率代码如下： Integer i; For i = 0 To A_AccountCount() - 1 { //获取账户对应合约的手续费率 CommissionRate cRate; ret = A_GetCommissionRate(Symbol, cRate, i); Print("A_GetCommissionRate合约" + Symbol + "的手续费率:" + IIFString(ret, "True", "False") + "\n" + Text(cRate)); //获取账户对应合约的保证金率 MarginRate mRate; ret = A_GetMarginRate(Symbol, mRate, i); Print("A_GetMarginRate:" + IIFString(ret, "True", "False") + "\n" + Text(mRate)); }确定模拟账户一定登录并绑定了，返回值如下：问题：1. 为什么A_GetCommissionRate返回了False