在风险处置方法中，损失管理的途径有（） ["担保","保险","风险预防","风险自留"]
每个文件都有一个主页面，包含有3个默认图层，它们是（） ["网格图层","导线图层","桌面图层","文字图层"]
下列表述正确的是（）。 ["申请进口废物作原料利用的企业必须是依法成立的企业法人，并具有利用进口废物的能力和相应的污染防治设备。","进口废物前，废物进口单位应事先取得国家环境保护局签发的《进口废物批准证书》。废物进口单位与境外贸易关系人签订的进口废物合同中，必须订明进口废物的品质和装运前检验条款；","进口废物，必须由中国检验检疫机构指定或认可的其他检验机构实施装运前检验，检验合格后方可装运。","进口废物，装运前不需要检验，只要到岸检验合格即可。"]
请写出，气焊时防止气孔的主要措施。
Refer to the exhibit. Routers R1 and R2 are running EIGRP and have converged. On the basis of the information that is presented, which statement is true? （） [" Both outgoing and incoming routing updates on R1 will be permitted because the d istribute - list 20 out Serial0\/0 command cannot be used with association with the outgoing interface."," All incoming routing updates from R2 will be suppressed, but the outgoing updates will continue to be sent."," Both outgoing and incoming routing up dates on R1 will be stopped because of the passive - interface Serial0\/0 configuration statement."," All outgoing routing updates from router R1 to router R2 will be suppressed, but the inbound updates will continue to be received."]
对实体的怀疑
