模拟信号需要经过()三个步骤才能变成PCM数字信号。
A.取样
B.量化
C.编码
D.调制。
参考答案:A, B, C
对施工工艺方案的质量控制主要包括( )等内容。
A.全面正确地分析工程特征等资料,明确安全目标、质量标准、控制的重点和难点
B.制订合理有效的有针对性的施工技术方案和组织方案
C.合理选用施工机械设备和施工临时设施
D.选用和设计保证质量与安全的模具、脚手架等施工设备
E.编制工程所采用的新材料、新技术、新工艺的专项技术方案和质量管理方案
In every cultivated language there are two great classes of words which, taken together, comprises the whole vocabulary. First, there are those words (1) which we become acquainted in daily conversation, which we (2) , that is to say, from the (3) of our own family and from our familiar associates, and (4) we should know and use (5) we could not read or write. They (6) the common things of life, and are the stock in trade of all who (7) the language. Such words may be called "popular", since they belong to the people (8) and are not the exclusive (9) of a limited class.
On the other hand, our language (10) a multitude of words which are comparatively (11) used in ordinary conversation. Their meanings are known to every educated person, but there is little (12) to use them at home or in the market-place. Our (13) acquaintance with them comes not from our mother’s (14) or from the talk of our school-mates, (15) from books that we read, lectures that we (16) , or the more (17) conversation of highly educated speakers who are discussing some particular (18) in a style appropriately elevated above the habitual (19) of everyday life. Such words are called "learned", and the (20) between them and the "popular" words is of great importance to a right understanding of linguistic process.
7()
A.hire
B.apply
C.adopt
D.use