对于城市内部地域结构研究方法之一的城市填图方法来说，其主要方法有（）。 A.网络法

For more than two centuries, American’s colleges and universities have been the backbone of the country’s progress. They have educated the technical, managerial, (1) and provided generation after generation of national leaders. Today educators from around the globe are turning to U. S. institutions of higher learning (2) . They are apt to find many reasons for the excellence of American universities, but (3) stand out as watersheds:
Education (4) : In 1862 Congress enacted the Land-Grant College Act, which essentially extended the opportunity of higher education (5) , including such disenfranchised groups as women and minorities. Each state was permitted to sell large tracts of (6) and use the proceeds to endow at least one public college.
(7) : Over the years, the decentralization and diversity of the America’s colleges and universities have promoted competition for students and resources. Competitive pressure first arose (8) . The academy’s impact really grew after World War II, when (9) commissioned by President Roosevelt argued that it was the federal government’s responsibility to (10) for basic research. Instead of being centralized in government laboratories, scientific research (11) in American universities and generated increasing investment. It also gave graduate students research opportunities and helped (12) far and wide, to the benefit of industry, medicine and society as a whole.
(13) : The end of the World War II saw passage of the Servicemen’s Readjustment Act of 1944. The law, which provided for (14) for returning veterans, made an already democratic higher-education system accessible in ways that were (15) in Europe, opening the doors of the best universities to men and women who had (16) of going to college.
(17) : The creation of federal loan guarantees and subsidy programs, as well as outright grants for college students brought (18) to higher education and further helped to democratize access. Since its founding (19) , the Federal Family Education Loan Program has funded more than 74 million student loans worth more than (20) .

临床诊断试验中经常提及的“灵敏度”，在临床检验质量控制中，类似的指标是（）

A.假失控概率

B.误差检出概率

C.在控预测率

D.失控预测率

E.总失控概率

营养性缺铁性贫血选用下列哪项治疗最恰当

A．硫酸亚铁加维生素C加高蛋白饮食
B．维生素C加叶酸
C．维生素B12加高蛋白饮食
D．硫酸亚铁加叶酸
E．以上都不是

阅读自居易《杜陵叟》全诗，然后回答下面小题。
杜陵叟，杜陵居，岁种薄田一顷余。三月无雨旱风起，麦苗不秀多黄死。九月降霜秋早寒，禾穗未熟皆青干。长吏明知不申破，急敛暴征求考课。典桑卖地纳官租，明年衣食将何如？剥我身上帛，夺我口中粟。虐人害物即豺狼，何必钩爪锯牙食人肉！不知何人奏皇帝，帝心恻隐知人弊。白麻纸上书德音。京畿尽放今年税。昨日里胥方到门，手持尺牒榜乡村。十家租税九家毕，虚受吾君蠲免恩。

此诗表达了诗人怎样的思想感情？

行星齿轮减速器的输入轴与输出轴（）。

A、同轴

B、平行

C、垂直

D、异面垂直