酶的生产方法包括哪些？
始终做到“三个代表”，是我们党的（）。 ①立党之本 ②执政之基 ③第一要务 ④力量之源 ["①②④","①②③","②③④","①②③④"]
Which of these statements is true of routing protocols in a hub-and-spoke IPsec VPN topology?（） [" EIGRP can summarize per interface."," OSPF router databases remain independent."," When they are configured with stubs, EIGRP regularly floods the topology."," OSPF topology decisions are made independent of hierarchy or area."]
什么是经济换汇成本？简述据此判断投资项目是否可行的准则。
侦查人员的下列行为不正确的是（） ["侦查员小李一人对犯罪嫌疑人进行了讯问","由于犯罪嫌疑人是聋哑人，讯问时应当有通晓聋、哑手势的人参加","将犯罪嫌疑人拘传了24小时","将犯罪嫌疑人传唤到该市某酒店讯问"]
下列词语中如有错别字，请纠正。
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戒骄戒躁 兔死狐悲 穿流不息 大浪滔天
