绘制网络图时应尽量避免箭线交叉,当交叉不可避免时,可用____或____处理。
过桥法;指向法
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The traditional method of food drying is to put it in places through which hot air is blown at temperature of about 110°C at entry to about 43°C at exit. This is the usual method for drying such things as vegetables, meat and