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当前学科：社会保障学
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试论述社会保障的意义。
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【D2】SPEAKER A: HERE ARE OUR TICKETS AND PASSPORTS. WE" RE FLYING TO AMSTERDAM TODAY. SPEAKER B: WELCOME TO YOUTH. LET" S SEE...YES, YOUR PASSPORTS ARE STILL VALID AND YOUR TICKETS ARE IN ORDER.【D1】______ SPEAKER A: JUST THESE TWO. SPEAKER B: PLEASE PUT THEM ON THE SCALES. ANY CARRY-ON BAGGAGE? SPEAKER A: YES, TWO PIECES. OH, AND THIS CAMERA. SPEAKER B: IT"S BETTER TO PUT THESE IDENTIFICATION TAGS ON THEM.【D2】______ SPEAKER A: NON-SMOKING, PLEASE. AND COULD WE HAVE ONE WINDOW SEAT, PLEASE? SPEAKER B: LET ME SEE. OH,【D3】______ALL RIGHT. YOU" RE ALL SET. I" VE STAPLED YOUR TWO BAGGAGE CLAIM STUBS TO YOUR RETURN TICKETS. SPEAKER A: THESE TWO? SPEAKER B: YES. AND HERE ARE YOUR BOARDING PASSES. YOU HAVE SEATS 20A AND 20B. YOUR FLIGHT IS ON TIME, AND IT"S LEAVING FROM GATE 12. DON"T FORGET TO PAY THE AIRPORT TAX BEFORE YOU BOARD.【D4】______ SPEAKER A: THANKS A LOT. A. DO YOU WANT SMOKING OR NON-SMOKING SEATS?B. HAVE A PLEASANT FLIGHT.C. HOW MANY PIECES DO YOU WANT TO CHECK IN?D. HERE ARE TWO LEFT.
营销观念陈旧，营销手段单一，营销管理滞后是农产品营销体系存在的问题。
需要层次理论是（ ）提出的。
有系膜的肠管活动度大。
月经先后无定期常见的转归为（）
培养基配制时，最好在（）前再检查一遍各种物质是否都已加入。
土壤温度随着深度的增加而递增时，属于（）。
塔类设备顺装法的缺点是吊装高度大，高空作业大，操作安全感（）。
奥氏体的形成速度，随着钢中（）而加快。