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已知加密算法及待破译的密文，这种攻击类型是()。

A. 唯密文攻击
B. 已知明文攻击
C. 选择明文攻击
D. 选择密文攻击

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If there is an oil-supply disruption resulting in higher international oil prices, domestic oil prices in open-market countries such as the United States will rise as well, whether such countries import all or none of their oil. If the statement above concerning oil-supply disruptions is true, which of the following policies in an open-market nation is most likely to reduce the long-term economic impact on that nation of sharp and unexpected increases in international oil prices？

A. Maintaining the quantity of oil imported at constant yearly levels.
B. Increasing the number of oil tankers in its fleet.
C. Suspending diplomatic relations with major oil-producing nations.
Decreasing oil consumption through conservation.
E. Decreasing domestic production of oil.

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县级以上地方人民政府卫生行政部门应当根据现场卫生状况确定公共场所的卫生信誉等级。()

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献血后五个月即可再次献血。()

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卫生监督人员在对某菌(毒)保藏机构的菌(毒)种与样本使用管理情况的执法检查中发现，该菌(毒)保藏机构提供菌(毒)种与样本使用管理的规章制度中规定，对申请提供菌(毒)种和样本的实验室资质进行审查，有合法资质的实验室可以获得申请的菌(毒)种和样本。()

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已知加密算法及待破译的密文，这种攻击类型是()。

A. 唯密文攻击 B. 已知明文攻击 C. 选择明文攻击 D. 选择密文攻击

县级以上地方人民政府卫生行政部门应当根据现场卫生状况确定公共场所的卫生信誉等级。()

献血后五个月即可再次献血。()

A. 唯密文攻击
B. 已知明文攻击
C. 选择明文攻击
D. 选择密文攻击