分解因式:a2-b2+4a+2b+3=______.

题型:填空题

问题:

分解因式:a2-b2+4a+2b+3=______.

考点:因式分解
题型:填空题

复制耐高温模型时琼脂材料灌注的最佳温度是()

A.15~25℃

B.50~55℃

C.60~70℃

D.35~45℃

E.越低越好

题型:填空题

下列做法你认为合理的是(  )

A.用甲醛溶液浸泡水产品

B.用聚乙烯制作食品保鲜膜

C.用添加苏丹红的饲料喂鸭子

D.用水将霉变大米清洗后食用

题型:填空题

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.

(73)是()

A.regarded

B.impressed

C.influenced

D.effected

题型:填空题

中 * * 党在陕北召开的哪次会议制定了全面抗战路线?()

A.瓦窑堡会议

B.八七会议

C.洛川会议

D.中共七大

题型:填空题

简述仓泵的启动操作。

更多题库