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关于队列研究的特点，下列错误的是（）。
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种子检验的（），主要是为了正确计算单位面积的播种量和产苗量。
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在气相色谱分析中，一般以分离度（）作为相邻两峰已完全分开的标志。
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根据材料，完成题。 Fitness Movement The fitness movement that began in the late 1960s and early 1970s centered around aerobic exercise.Millions of individuals became engaged in a variety of aerobic activities, and51thousands of health spas developed around the country to capitalize on his52interest in fitness, particularly aerobic dancing for females. A number of fitness spas existed53to this aerobic fitness movement, even a national chain with spas in most major cities. However, their54was not on aerobics, but rather on weight-training programsdesigned to develop muscular mass, 55, and endurance in their primarily male56. These fitness spas did not seem to benefit57from the aerobic fitness movement to better health, since medical opinion suggested that weight-training programs58few, if any, health benefits. In recent years, however, weight training has again become increasingly. 59for males and for females. Many60programs focus not only on developing muscular strength and endurance but on aerobic fitness as well.61, most physical fitness tests have usually included measures of muscular strength and endurance, not for health related reasons, butprimarily62such fitness components have been related to performance in athletics.63, in recent years,evidence has shown that training programs designed primarily to improve muscular strength and endurance might also offer some health64as well. The American College of Sports Medicine now65that weight training be part of a total fitness program for healthy Americans.请在第__(51)__处填上正确答案。
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爬坡度角
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工地材料厂集中供应的主要材料的价格不得超过（）。
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服务器按机箱结构划分为（）。
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对于福建省农村信用社发行的金融IC卡中的电子现金账户，下列描述错误的是（）。
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长期高血压，随着细小动脉硬化等病变各脏器发生继发性改变，其中最为重要的是（）
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按网络的（）方式分类，网络可以分为广域网（WAN）、局域网（LAN）、城域网（MAN）。