对农作物单位面积产量调查,按平原、丘陵和山区分组来抽选样本单位,此种抽样方法为()。

题型:单项选择题

问题:

对农作物单位面积产量调查,按平原、丘陵和山区分组来抽选样本单位,此种抽样方法为()。

A.整群随机抽样

B.分层随机抽样

C.多阶抽样

D.系统随机抽样

考点:统计从业统计基础知识与统计实务2008统计从业资格考试《统计基础知识与统计实务》试题
题型:单项选择题

As Philadelphia grew from a small town into a city in the first half of the eighteenth century, it became an increasingly important marketing center for a vast agricultural hinterland. Market days (1) the crowded city even more crowded, as farmers from within a (2) of 24 or more kilometers brought their sheep, vegetables, cider and other products for direct sale to the (3) . The High Street Market was continuously (4) throughout the period until 1736, (5) it (6) from Front Street to Third. By 1745 New Market was opened on Second Street. The next year the Callow Hill Market began (7) .

Along with market days, the (8) of twice-yearly fairs persisted in Philadelphia (9) after similar trading days had been discontinued in other colonial cities. The (10) provided a means of bringing handmade goods from (11) places to would-be buyers in the city. Linens and stockings from Germantown, (12) , were popular items.

Auctions were another popular (13) of trade. Because of the competition, retail (14) opposed these as well as the fairs. (15) governmental attempts to eradicate fairs and auctions were less than successful, the ordinary (16) of economic development was on the merchants’side, as increasing business specialization became the (17) of the day. Export merchants became differentiated from their importing counterparts, and specialty shops began to appear (18) general stores selling a variety of goods.

One of the reasons Philadelphia’s merchants prospered was because the surrounding area was undergoing tremendous economic and demographic growth. They did their business, (19) , in the capital city of the province, (20) to not only the governor and his circle, but citizens from all over the colony.

3()

A.townspeople

B.farmers

C.merchants

D.governors

题型:单项选择题

男性,71岁。有糖尿病和吸烟史,行走50米自感小腿麻木并伴有疼痛,休息后即缓解。查体左侧股动脉及以远动脉均未触及,皮温较对侧明显为凉,末梢苍白。初步诊断为()

A.雷诺氏病

B.糖尿症足

C.多发性大动脉炎

D.闭塞性周围动脉粥样硬化

E.下肢静脉曲张

题型:单项选择题

某地区有10万人口,1960年总死亡人数为1000名,已发现的结核病患者有300名,其中男性200名,女性100名。1960年死于结核病者60名,其中男性50名。

该地区结核病的死亡率为()。

A.300/10万

B.60/10万

C.200‰

D.20‰

E.10/万

题型:单项选择题

女性,26岁。以浮肿,发热1个月入院。体检:贫血貌,血压稍增高,血肌酐140μmol/L,血清补体C3降低,血清抗核抗体阳性,抗ds-DNA抗体阳性()

A.IgA肾病

B.原发性肾病综合征

C.紫癜性肾炎

D.急进性肾炎

E.狼疮性肾炎

题型:单项选择题

乙型脑炎三大严重症状是()

A.高热、抽搐和昏迷

B.高热、昏迷和呼吸衰竭

C.高热、脑膜刺激征和呼吸衰竭

D.高热、抽搐和呼吸衰竭

E.高热、失语和呼吸衰竭

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