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人们通常说的“第四媒体”指的是什么？
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在第二次世界大战中潜艇如何大开杀戒？
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交通性质的公共建筑，如火车站等，常在人流疏散集中的地方设置（），以利于安全快速疏散的要求。
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男性，65岁。以往血压正常，最近体检发现非同日3次测定血压为24/12kPa（180/90mmHg）。此时应判断为（）
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我国的耕地有多少亿亩（）
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孟浩然诗歌最主要的内容是（）。
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人体需要的营养素中，在各种营养素中排行第七的营养素是什么（）
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satisfactory, subject to, shipping mark, quotation, confirmed, commodity, specification, payable, opportunity, satisfied, informed, price Firm offer of Men's shirt Dear Sirs, Thank you for your letter of April 5th asking for our(1)for Men's Shirt, and now we are sending you the following offer,(2)your reply reaching us here by the end of this month. (3): Men's Shirt (4): S/3, M/6, L/3 Color: white, blue, green yellow Quantity: 6000dozens Packing: each in a plastic bag and 10 dozens in a carton (5): at buyer's option (6): US $200 per dozen CIFC 2% Hong Kong. Shipment: March/April, 2008 Terms of payment: By 100%(7)irrevocable L/C(8)by draft at sight to be opened 30 days before the time of shipment. We hope our products will be(9)to you in every way and trust you will give us the(10)to serve you soon. Yours truly,
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对于主动性异位心律，下列哪项不正确（）.