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网络防火墙的主要类型为包过滤路由哭、应用级网关和_____网关。

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某堤防工程项目，经有关部门批准采取公开招标的方式确定了中标单位并签订合同。
1．该工程合同条款中部分规定如下：
(1)由于设计未完成，承包范围内待实施的工程虽然性质明确，但工程量还难以确定，双方商定拟采用总价合同形式签订施工合同，以减少双方的风险。
(2)施工单位按建设单位代表批准的施工组织设计(或施工方案)组织施工，施工单位不承担因此引起的工期延误和费用增加的责任。
(3)甲方向施工单位提供场地的工程地质和地下主要管网线路资料，供施工单位参考使用。
(4)建设单位不能将工程转包，但允许分包，也允许分包单位将分包的工程再次分包给其他施工单位。
2．在施工招标文件中，按工期定额计算，该工程工期为573天。但在施工合同中，双方约定：开工日期为 2002年12月15日，竣工日期为2004年7月25日，日历天数为586天。
3．在工程实际实施过程中，出现了下列情况：
(1)工程进行到第6个月时，国务院有关部门发出通知，指令压缩国家基建投资，要求某些建设项目暂停施工。该工程项目属于指令停工下马项目，因此，业主向承包商提出暂时中止合同实施的通知。承包商按要求暂停施工。
(2)复工后在工程后期，工地遭遇当地百年罕见的台风袭击，工程被迫暂停施工，部分已完工程受损，现场场地遭到破坏，最终使工期拖延了2个月。
问题
1．该工程合同条款中约定的总价合同形式是否恰当？请说明原因。
2．该工程合同条款中除合同价形式的约定外，有哪些条款存在不妥之处？请指出来，并说明理由。
3．本工程的合同工期应为多少天？为什么？
4．在工程实施过程中，出现的国务院通知和台风袭击引起的暂停施工问题应如何处理？

雪莱的《西风颂》：“冬天如果来了，＿＿？”

Financial Risks
Several types of financial risk are encountered in international marketing; the major problems include commercial, political, and foreign exchange risk.
(46)They include solvency, default, or refusal to pay bills. The major risk, however, is competition which can only be dealt with through consistently effective management and marketing.(47)Such risk is encountered when a controversy arises about the quality of goods delivered, a dispute over contract terms, or any other disagreement over which payment is withheld. One company, for example, shipped several hundred tons of dehydrated potatoes to a distributor in Germany.(48)The alternatives for the exporter were reducing the price, reselling the potatoes, or shipping them home again, each involving considerable cost.
Political risk relates to the problems of war or revolution, currency inconvertibility, expropriation or expulsion, and restriction or cancellation of import licenses.
(49)Management information systems and effective decision-making processes are the best defenses against political risk. As many companies have discovered, sometimes there is no way to avoid political risk, so marketers must be prepared to assume them or give up doing business in a particular market.
Exchange-rate fluctuations inevitably cause problems, but for many years, most firms could take protective action to minimize their unfavorable effects.(50)International Business Machine Corporation, for example, reported that exchange losses resulted in a dramatic 21.6 percent drop in their earnings in the third quarter of 1981. Before rates were permitted to float, devaluations of major currencies were infrequent and usually could be anticipated, but exchange-rate fluctuations in the float system are daily affairs.
A Political risk is an environmental concern for all businesses.
B One unique risk encountered by the international marketer involves financial adjustments.
C Commercial risks are handled essentially as normal credit risks encountered in day-to-day business1.
D The distributor tested the shipment and declared it to be below acceptable taste and texture standards.
E Floating exchange rates of the world's major currencies have forced all marketers to be especially aware of exchange-rate fluctuations and the need to compensate for them in their financial planning.
F Many international marketers go bankrupt each year because of exchange-rate fluctuation.

《诗经》中的《颂》包括＿＿、＿＿、＿＿三部分。