对闸阀、截止阀和逆止安装方向应如何考虑？

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.

5（）

A.that

B.what

C.how

D.when

男，30岁，2天前受凉后突然寒战、高热、胸痛、咳铁锈色痰。

拟诊考虑为（）

A.支原体肺炎

B.克雷伯杆菌肺炎

C.金葡菌肺炎

D.肺炎链球菌肺炎

E.铜绿假单胞菌肺炎

在switch语句中，每个语句标号所含关键字case后面的表达式必须是（）

根据《华润置地写字楼物业服务通用标准（2011版）》要求，给排水系统管理要求设备检修（维保）有检修记录，该记录应保存（）。

A.1年

B.2年

C.3年

D.4年

竞争者的干扰或沟通不畅，会引致（）模糊。

A.市场关系

B.市场服务

C.市场定位

D.市场形象