企业采用备抵法核算坏账准备，估计坏账损失的方法有（） ["应收账款余额百分比法","账龄分析法","年数总和法","销货百分比法","双倍余额递减法"]
属于中南地区的少数民族是 ["A、土家族","B、纳西族","C、白族","D、黎族","E、壮族"]
Questions from 31 to 35 are based on the following passage: ["Questions from 31 to 35 are based on the following passage:"," The exporter, as drawer of a draft (bill of exchange), hands the draft to his bank, the remitting bank, who in turn forwards it to the buyer through a collecting bank in the buyer’s country. A draft (also called a bill) is a written order to a bank or a customer to pay someone on demand or at a fixed time in the future a certain sum of money. If shipping documents accompany the draft, the collection is called “documentary collection.”"," Documentary collection falls into two major categories: one is documents against payment(D/P); the other, documents against acceptance (D/A)."," Documents against payment, as the term suggests, is that the collecting bank will only give the shipping documents representing the title to the goods on the condition that the buyer makes payment."," Where the paying arrangement is D/A, the collecting bank will only give the buyer the shipping documents after buyer’s acceptance of the bill drawn on him, i.e. the buyer signs his name on the bill promising to pay the sum when it matures. In return he gets what he needs – the shipping documents."," Under D/A, the seller gives up the title to the goods – shipping documents before he gets payment of the goods. Therefore, an exporter must think twice before he accepts such paying arrangement."]
Questions from 31 to 35 are based on the following passage: ["Questions from 31 to 35 are based on the following passage:"," The exporter, as drawer of a draft (bill of exchange), hands the draft to his bank, the remitting bank, who in turn forwards it to the buyer through a collecting bank in the buyer’s country. A draft (also called a bill) is a written order to a bank or a customer to pay someone on demand or at a fixed time in the future a certain sum of money. If shipping documents accompany the draft, the collection is called “documentary collection.”"," Documentary collection falls into two major categories: one is documents against payment(D/P); the other, documents against acceptance (D/A)."," Documents against payment, as the term suggests, is that the collecting bank will only give the shipping documents representing the title to the goods on the condition that the buyer makes payment."," Where the paying arrangement is D/A, the collecting bank will only give the buyer the shipping documents after buyer’s acceptance of the bill drawn on him, i.e. the buyer signs his name on the bill promising to pay the sum when it matures. In return he gets what he needs – the shipping documents."," Under D/A, the seller gives up the title to the goods – shipping documents before he gets payment of the goods. Therefore, an exporter must think twice before he accepts such paying arrangement."]
被告人：段某，男，28岁，某县化工厂财务科科长。胡某，男，57岁，某县化工厂财务会计。 某年，该县化工厂动员职工集资扩建工厂，段、胡两人通过私人关系，以化工厂名义从县建设银行贷款10万元，然后以个人集资形式，分别将其中的8万元、2万元高息贷给厂里，一年后，段获取利息差12000元，胡获取利息差3600元。 【问题】对段、胡两人的行为如何定性？
传输级网关防火墙技术的优缺点是什么？
