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营养性缺铁性贫血选用的治疗，最恰当的是
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10岁女孩，学校常规体检时发现胸骨左缘第2肋间可闻及Ⅲ级收缩期杂音，经心脏彩超诊断为房间隔缺损。该患儿杂音产生的原理是
下列药物不属于支气管扩张剂的是
The holiday shopping season got off to a flying start over theThanksgiving(感恩节) weekend in the U.S.Retailers(零售商) attracted discount-hungry consumers withspecials(特价商品) of televisions, DVD players and other gifts. Discounters like Wal-Mart and Target had the greatest success, offering customers early bird specials, while major department stores and clothing chains only met modest sales goals. Online sales were also strong."It was as expected. It wasn"t source of great prosperity, but it was a good start," said Nevill, a man in a U.S. retail consulting firm. He said, "One thing we often heard was that only things markeddown(降价) were selling. Consumers want a bargain, especially around the holiday." Shoppers did seem to like the many markdowns. A lady in the State of Connecticut said, "I"ve never seen so many sales. I feel like a kid in a candy store."Nevill estimated that discounters had a 4% gain over last year"s Thanksgiving figure, while sales at department stores and mall-based clothing chains were up 2% for the weekend. However, the Thanksgiving weekend is not necessarily a good way to judge how retailers will be successful for the season. Over the past few years, the weekend accounted for less than 10% of sales.Online merchants also had a good weekend. Sales were up 61% last Friday, compared to the day after Thanksgiving a year ago. By saying "I feel like a kid in a candy store," the lady in Connecticut probably means that ______.
关于脑疝，下列叙述不正确的是
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