[单项选择]装好配刮轴及上轴瓦、双头螺柱、轴承盖，然后紧固螺母，同时转动配刮轴，配刮轴必须（）。
A. 紧
B. 松
C. 松和紧都可
D. 松紧适中

The small size of the components of computer chips has proved unstoppable. In each new (1) , those components are smaller and more tightly packed than they were in their predecessor. (2) has been so rapid that chip designers are (3) apparently fundamental barriers to further reductions in size and increases in density. In a small size version of the (4) to wireless communication in the macroscopic world, a group of researchers led by Alain Nogaret, think they can make chips (5) components talk to each other wirelessly.
The researchers (6) to use the standard print techniques employed in chipmaking to coat a semiconductor with tiny magnets. These magnets will (7) local magnetic fields that point in opposite directions at different points (8) the chip’s surface. Electrons have a (9) called spin--that is affected by magnetic fields, and the team hopes to use a/an (10) called invers
A. relation
B. consideration
C. information
D. generation

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 preelectronic mediam, following in the wake of the pamphlet and the book and in the company of the periodical. It was during the same time that the communications revolution speeded 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 processin perspective. It is important to do so.
It is generally recognized, however, that the introduction of the computer in the early 20th century, (35) by the invention of the integrated circuit daring the 1960s, radically changed the process, although its impact on the media was not immediately (36) A. above
B. upon
C. against
D. with