沈阳某机床厂委托辽宁省某进出口公司代理从德国进口10台机床。此代理关系中，因机床需要从国外进口，因此，沈阳某机床厂与辽宁省某进出口公司形成涉外代理关系。
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When an OSPF design is planned, which implementation can help a router not have memory resource issues?（）
A. Have a backbone area (area 0) with 40 routers and use default routes to reach external destinations
B. Have a backbo ne area (area 0) with 4 routers and 30,000 external routes injected into OSPF
C. Have less OSPF areas to reduce the need for interarea route summarizations
D. Have multiple OSPF processes on each OSPF router. Example, router ospf 1, router ospf 2
有机磷农药对（）有选择性的抑制作用，阻止已释放的（）的清除，引起中毒症状。
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