凝结时间从水泥与水接触时开始计算。

题型:判断题

问题:

凝结时间从水泥与水接触时开始计算。

考点:质量检测人员考试外加剂检测外加剂检测题库
题型:判断题
(x2+2)(
1
x
-1)5
的展开式的常数项是______.
题型:判断题

下面措施中,属于减小压强的是(  )

A.长矛有着锐利的尖端

B.缝衣针的针头做得很尖

C.纸盒包装饮料常配有一根一端很尖的塑料吸管

D.把书包带做得宽些

题型:判断题

井上下必须设置消防材料库。()

题型:判断题

Comparisons were drawn between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries. Yet much had happened between. As was discussed before, it was not until the 19th century that the newspaper became the dominant pre- electronic (61) , following in the wake of the pamphlet and the book and in the (62) of the periodical. It was during the same time that the communications revolution (63) UP, beginning with transport, the railway, and leading on through the telegraph, the telephone, radio, and motion pictures into the 20th-century world of the motor car and the air plane. Not everyone sees that process in (64) . It is important to do so.

It is generally recognized, (65) , that the introduction of the computer in the early 20th century, (66) by the invention of the integrated circuit during the 1960s, radically changed the process, although its impact on the media was not immediately (67) . As time went by, computers became smaller and more powerful, and they became "personal" too, as well as (68) , with display becoming sharper and storage (69) increasing. They were thought of, like people, (70) generations, with the distance between generations much (71) .

It was within the computer age that the term "information society" began to be widely used to describe the (72) within which we now live. The communications revolution has (73) both work and leisure and how we think and feel both about place and time, but there have been (74) view about its economic, political, social and cultural implications. "Benefits" have been weighed (75) "harmful" outcomes. And generalizations have proved difficult.

(62)是()

A.process

B.company

C.light

D.form

题型:判断题

推土机在上下坡道时,如果感觉速度太小应()

A、换高速档

B、换低速档

C、保持现有挡位

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