`class FirstStrategy(CtaTemplate):
author = "用Python的交易员"
default_pricetick = 4
default_cancel_order_second = 2
default_stop_pos_second = 40
cancel_order_times = 0
bullorder = {
"orderid": "",
"open_price": 0,
"stoploss_price" : 0,
"takeprofit_price" : 0,
"open_time": None,
"trade_time": None,
"status": "INIT",
}`
以上代码， 启动多个品种，如图：
运行过程中发现A品种设置的变量值赋值给所以启动的品种， 请问这是怎么回事
