在下列物理化学除氟方法中,目前最常用的一种方法是A.混凝沉淀法B.骨碳吸附法C.电凝

题型:单项选择题

问题:

在下列物理化学除氟方法中,目前最常用的一种方法是

A.混凝沉淀法
B.骨碳吸附法
C.电凝聚法
D.活性氧化铝法
E.电渗析法

考点:卫生资格考试(中初级)疾病控制专业知识疾病控制主治医师专业知识
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In 1998 consumers could purchase virtually anything over the Internet. Books, compact discs, and even stocks were (1) from World Wide Websites that seemed to (2) almost daily a few years earlier, some people had predicted that consuners accustomed to shopping in stores would be (3) to buy things that they could not see or touch (4) . For a growing number of time-starved consumers, however, shopping from their home computer was proving to be a convenient (5) to driving to the store.

A research estimated that in 1998 US consumers could purchase $ 7.3 billion of goods over the Internet, double the 1997 total. Finding a bargain was getting easier, (6) the rise of online auctions and Websites that did comparison shopping on the Internet for the best (7) .

For all the consumer interest, (8) in eyberspaee was still a largely (9) business, however. Internet pioneer Amazon. eom, which began selling books in 1995 and later (10) into recorded music and videos, posted (11) of $ 153.7 million in the third quarter, up from $ 37.9 million in the same period of 1997. Overall, (12) , the company’ s loss widened to $ 45.2 million from $9.6 million, and analysts did not expect the company to turn a profit (13) 2001. (14) the great loss, Amazon. tom had a stock market value of many billions, reflecting investors’ (15) about the future of the industry.

Internet retailing appealed (16) investors because it provided an efficient means for reaching millions of consumers without having the cost of operating (17) stores with their armies of salespeople. Selling online carried its own risks, however, (18) so many companies competing tor consumers’ attention, price competition was (19) and profit (20) thin or nonexistent.

17()

A.habitual

B.reutilized

C.conventional

D.customary

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软产道的组成部分下列哪项是错误的()。

A.子宫体

B.子宫下段

C.子宫颈

D. * *

E.盆底软组织

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兔子是跑步冠军,可是不会游泳。于是,兔子去学游泳,结果耗费了大半生的精力也没有学会游泳。这说明,要自强就必须[ ]

A.认清自己的外在形象

B.不理睬他人的态度和评价

C.给予自己积极的心理暗示,增强自信

D.了解自己的长处和短处,善于扬长避短

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出租汽车驾驶员服务工作的优劣与其自身聪业道德水平的高低()关系。

A.有着密切

B.有着一定

C.毫无

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新办矿山申请《采矿许可证》需要提交什么资料?

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