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保证底片质量的关键要点有哪些？

答案

参考答案：

1、选用焦点小、穿透力足够的射线源。

2、选用颗粒度小的感光胶片和金属箔增感屏。

3、选用合适的曝光条件以及射源、工件和胶片三者之间的最佳布置。

4、选用合适的显定影配方，精心处理。

单项选择题

在全面建成小康社会中重视社会主义核心价值观建设，在全面深化改革中强调坚持社会主义方向，在全面依法治国中坚持以中国特色社会主义法治理论为指导，在全面从严治党中注重思想建党、坚定理想信念，都是强调（）具有反作用。

A、精神对物质、社会意识对社会存在

B、精神对物质

C、社会意识对社会存在

D、主观对客观
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单项选择题

The nobler and more perfect a thing is, the later and slower it is becoming mature. A man reaches the mature (1) of his reasoning powers and mental faculties (2) before the age of twenty-eight; a woman at eighteen. And then, too, in the case of woman, it is the only reason of a sort--very mean in its (3) . That is why women remain children their whole life long; never seeing (4) but what is quite close to them, (5) fast to the present moment, taking appearance for (6) , and preferring (7) to matters of the first importance. For it is (8) his reasoning faculty that man does not live in the present only, (9) the brute, but looks about him and considers the past and the future; and this is the origin of (10) , as well as that of care and anxiety which so many people (11) Both the advantages and the disadvantages, which this (12) , are (13) in by the woman to a smaller extent because of her weaker power of reasoning. She may, in fact, be described as intellectually shortsighted, (14) , while she has an immediate understanding of what lies quite close to her, her field of (15) is narrow and does not reach to what is (16) ; so that things which are absent, or past, or to come, have much less effect upon women than upon men. This is the reason why women are inclined to be (17) and sometimes carry their desire to a (18) that borders upon madness. In their hearts, women think it is men’s business to earn money and theirs to spend it--if possible during their husband’s life, (19) , at any rate, after his death. The very fact that their husband hands them (20) his earnings for purposes of housekeeping strengthens them in this belief.

1（）

A.burden

B.drive

C.stage

D.move
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