JPEG专家组提供了两种基本的压缩算法，一种是以离散余弦变换为基础的 (51) ，另一种是以预测技术为基础的 (52) 。
（51）处填（）。| "The word ’protection’ is no longer
taboo (禁忌语)" This short sentence, uttered by French President Nicolas Sarkozy
late last month, may have launched a new era in economic history. Why For
decades, Western leaders have believed that lowering trade barriers and tariffs
was a natural good. Doing so, they reasoned, would lead to greater economic
efficiency and productivity, which in turn would improve human welfare.
Championing free trade thus became a moral, not just an economic,
cause. These leaders, of course, weren’t acting out of unselfishness. They knew their economies were the most competitive, so they’d profit most from liberalization. And developing countries feared that their economies would be swamped by superior Western productivity. Today, however, the tables have turned—though few acknowledge it. The West continues to preach free trade, but p A. it is beneficial to their economies B. it is supported by developing countries C. it makes them keep faith in their principles D. it is advocated by Joseph Schumpeter and Adam Smith [单选题] 2008年发生在四川地区的“5.12”地震属于哪一类突发事件?( )
A. 自然灾害 B. 事故灾难 C. 社会安全事件 D. 公共卫生事件 [单选题]直流电源特殊巡视要求交流电源恢复后，应检查直流电源运行工况，直到直流电源恢复到（）运行方式，方可结束特巡工作
A.限压充电 B.均衡充电 C.恒流限压充电 D.浮充 [多选题]查询公司规章制度的一般方式为（）
A.A:经济法律一级部署信息系统。 B. C.略 D.略 E.略 F.略 [单项选择]X线管阴极的作用是
A. 发射电子并聚焦 B. 只发射电子 C. 只聚焦 D. 散热 E. 产生X线 [简答题]水泥出厂合格证应验收哪些内容？
[单项选择]蒸汽喷射式制冷系统通常用水(也可用氨或氟利昂)作为制冷剂，适用于空调系统和______以上低温水生产工艺中。
A. -15℃ B. -5℃ C. 0℃ D. 4℃ [单选题]发生三相对称短路时，短路电流中包含（）分量。
A.负序 B.正序 C.零序 D.负荷电流 [单选题]票据置换不良贷款纳入责任清收范围，统一清收处置标准，以（）为主，其他方式为辅。
A.委托清收 B.货币清收 C.债权转让 [单选题] 根据《行政复议法》 规定， 关于行政复议机关作出行政复议决定， 下列哪一选项是正确的？
A.不需要集体讨论可直接通过 B.需经行政复议机关的每个人同意 C.需经行政复议机关的负责人同意或者集体讨论通过 D.只需少数服从多数 [不定项选择题]重车重心高度在2800mm时，运行限速在（ ）km/h。
A.30 B.40 C.50 D.60 [单选题]依据《中国南方电网有限责任公司电力安全工作规程》，厂站设备是指发电厂、变电站、开关站、换流站、串补站内的设备以及()配电设备。
A.高压 B.中压 C.低压 D.超高压 [单项选择]
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