试题与答案

确定低氟区饮水是否加氟的条件因素不包括() A.低氟区饮水氟含量 B.低氟区氟牙症指

题型:单项选择题

题目:

确定低氟区饮水是否加氟的条件因素不包括()

A.低氟区饮水氟含量

B.低氟区氟牙症指数

C.低氟区15岁儿童龋均

D.低氟区饮食习惯

E.低氟区季节、气温变化

答案:

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题型:单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.
Spread spectrum simply means that data is sent in small pieces over a number of the (16) frequencies available for use at any time in the specified range. Devices using (17) spread spectrum(DSSS) communicate by (18) each byte of data into several parts and sending them concurrently on different (19) . DSSS uses a lot of the available (20) , about 22 megahertz(MHz).

A.direct-sequence

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