有没高用帮我看看这个EA为什么不能下空单

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//|                                     ma_2010.mq4 |
//|               Copyright ?2011, metaQuotes Software Corp. |
//|                            [|
//+------------------------------------------------------------------+
#property copyright Copyright ?2011, metaQuotes Software Corp.
#property link     
//--- input parameters
extern color   big_ma=24;
extern color   small_ma=10;
//+------------------------------------------------------------------+
//| expert initialization function                       |
//+------------------------------------------------------------------+
int start()
 {
    double bigma=iMA(Symbol(),0,big_ma,0,MODE_EMA,PRICE_CLOSE,0);
    double smallma=iMA(Symbol(),0,small_ma,0,MODE_EMA,PRICE_CLOSE,0);
    double bigmap=iMA(Symbol(),0,big_ma,0,MODE_EMA,PRICE_CLOSE,1);
    double smallmap=iMA(Symbol(),0,small_ma,0,MODE_EMA,PRICE_CLOSE,1);
   if((smallma bigma) (smallmap bigmap))//死叉
     {
     if(OrdersTotal()==0)
        {
         OrderSend(Symbol(),OP_SELL,0.13,Bid,10,Bid+900*Point,Bid+650*Point, sell ,1,0,Blue);
       }
      }
   if((smallma bigma) (smallmap bigmap))//金叉
     {
     if(OrdersTotal()==0)
        {
         OrderSend(Symbol(),OP_BUY,0.13,Ask,10,Ask-900*Point,Ask+650*Point, buy ,1,0,Red);
       }
      }
   return(0);   
 }
//+------------------------------------------------------------------+

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