有关阳性对比剂说法正确的是（）。

[单选题]During a routine maintenance visit to a client， an administrator noticed that the last full backup did not complete. Which of the following should the administrator do FIRST？（）

[单选题]请阅读Passage 1，完成第 21~25小题。Passage 1What would you do with $ 590m? This is now a question for Gloria MacKenzie, an 84-year-old widow who recently emerged from her small, tin-roofed house in Florida to collect the biggest undivided lottery jackpot in history. If she hopes her new-found fortune will yield lasting feelings of fulfilment, she could do worse than read Happy Money by Elizabeth Dunn and Michael Norton.These two academics use an array ofbehavioral research to show that the most rewarding ways to spend money can be counterintuitive. Fantasies of great wealth often involve visions of fancy cars and extravagant homes. Yet satisfaction with these material purchases wears off fairly quickly. What was once exciting and new becomes old-hat; regret creeps in. It is far better to spend money on experiences, say Ms. Dunn and Mr. Norton, like interesting trips, unique meals or even going to the cinema. These purchases often become more valuable with time-as stories or memories particularly ifthey involve feeling more connected to others.This slim volume is packed with tips to help wage slaves as well as lottery winners get the most "happiness bang for your buck". It seems most people would be better off if they could shorten their commutes to work, spend more time with friends and family and less of it watching television(something the average American spends a whopping two months a year doing, and is hardly jollier for it). Buying gifts or giving to charity is often more pleasurable than purchasing things for oneself, and luxuries are most enjoyable when they are consumed sparingly. This is apparently the reason McDonald's restricts the availability of its popular McRib-a marketing trick that has turned the pork sandwich into an object of obsession.Readers of Happy Money are clearly a privileged lot, anxious about fulfilment, not hunger. Money may not quite buy happiness, but people in wealthier countries are generally happier than those in poor ones. Yet the link between feeling good and spending money on others can be seen among rich and poor people around the world, and scarcity enhances the pleasure of most things for away from this book believing it was money well spent.According to the last paragraph, Happy Money ____.

[单选题]下列各组物质中，因反应条件、用量、浓度等不同而发生不同化学反应的是（）。①C与O3②Fe与S③Na3与O3④CO3与NaOH溶液⑤Cu与硝酸⑥AgNO3溶液与氨水

[单选题]注意缺陷与多动障碍的治疗（）

[判断题]老聃，世称老子，他是道家学派创始人。

[单选题]为了提高服务质量，创造良好的服务口碑，很多的汽车生产厂家越来越重视（）的相关调查，以此来获得真实客观的评价，从而获取更大的市场空间。

[名词解释题]牺牲阳极保护法

[多选题]硬膜外麻醉血压明显下降时的处理措施有（）

[单选题]张骞开通西域之后，这条贯穿中西贸易的交通线路打通了。在张骞时代，这条贸易通道上转运的物品包括（）①丝绸②蔡侯纸③罗盘针④印刷品

[单选题]下列哪项不符合子宫颈癌描述？（）