Developments in international cooperation are often, it is suggested, the result of

A . setting tanks B . service tanks C . tanks D . drain tank

A . A、低压胎 B . B、超低压胎 C . C、高压胎 D . D、无内胎低压胎

A .  the signal to noise of the current optical amplifier B .  the signal to noise of the previous amplifier or source C .  the signal to noise introduced by the optical multiplexer D .  the accumulated noise to signal ratio of the optical channel

A . clockwise direction B . northeasterly direction C . northerly direction D . counterclockwise directio

A . 木锤子、手锯 B . 手锯、电源线（带插座板） C . 木锤子、锤子 D . 木锤子，电源线（带插座板）

A . 2in、4in B . 3in、4in C . 1/4in、1/8in D . 1/3in、1/4in

A . 7 in B . 7 in C . 8in D . 9i

A . 60% B . 75% C . 90% D . 50%

A . the signal to noise of the current optical amplifier B . the signal to noise of the previous amplifier or source C . the signal to noise introduced by the optical multiplexer D . the accumulated noise to signal ratio of the optical channel

A．newest B．latest C．nearest D．earliest

No clear-cut distinction can be drawn between professionals and amateurs in science: exceptions can be found to any rule. Nevertheless, the word "amateur" does carry a connotation that the person concerned is not fully integrated into the scientific community and, in particular, may not fully share its values. The growth of specialisation in the nineteenth century, with its consequent requirement of a longer, more complex training, implied greater problems for amateur participation in science. The trend was naturally most obvious in those areas of science based especially on a mathematical or laboratory training, and can be illustrated in terms of the development of geology in the United Kingdom. A comparison of British geological publications over the last century and a half reveals not simply an increasing emphasis on the primacy of research, but also a changing definition of what constitutes an acceptable research paper. Thus, in the nineteenth century, local geological studies represented worthwhile research in their own right; but, in the twentieth century, local studies have increasingly become acceptable to professionals only if they incorporate and reflect on the wider geo logical picture. Amateurs, on the other hand, have continued to pursue local studies in the old way. The overall result has been to make entrance to professional geological journals harder for amateurs, a result that has been reinforced by the wide spread introduction of refereeing, first by national journals in the nineteenth century and then by several local geological journals in the twentieth century. As a logical consequence of this development, separate journals have now appeared aimed mainly towards either professional or amateur readership. A rather similar process of differentiation has led to professional geologists coming together nationally within one or two specific societies, whereas the amateurs have tended either to remain in local societies or to come together nationally in a different way. Although the process of professionalisation and specialisation was already well under way in British geology during the nineteenth century, its full consequences were thus delayed until the twentieth century. In science generally, however, the nineteenth century must be reckoned as the crucial period for this change in the structure of science. The growth speeialisation in the 19th century might be more clearly seen in sciences such as ______. A．sociology and chemistry B．physics and psychology C．sociology and psychology D．physics and chemistry

A．Round structure built of stone B．Building with multiple living units C．Round hut made of branches and leaves D．Box-shaped structure with four walls