在进口贸易中，我方对外开证时，一般不主动开立可转让信用证，以免被动。
Which of the following is not a characteristic of fast switching？（） ["Fast switching reducesa routers CPU utilization， compared to process switching","All packets of a flow， except for the first packet， use the information in the fast cache","It can be enabled with the interface command ip route-cache","Fast switching uses a fast cache maintained in a router’s control plane","The fast cache contains information about how traffic from different data flows should beforwarded","Even though the fast switching is enabled， the first packet of a flow is still process switched"]
俗讲
《安全生产法》第六十九条规定，可以不建立事故应急救援组织的是（） ["危险物品的生产、经营、储存单位。","矿山企业。","建筑施工单位。","ABC以外生产经营规模较小者。"]
泛化
判断一个矿床是不是矽卡岩矿床要依据哪两个条件？
