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根据《电子计算机机房设计规范》(GB50174—93)，电子计算机机房应采用四种接地方式。将电气设备的金属外壳通过接地装置与大地直接连接起来是______。根据《建筑物防雷设计规范》(GB50057—1994)，每根引下线的冲击接地电阻不宜大于______Ω。
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机房隐蔽工程中，空调上下水管材质最适合使用______；当隐蔽的电缆槽道与屋内无保温层的热力管道交叉时，其最小净距一般是______。
第一节 听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。 Where is the man going
Read the following text and fill each of the numbered spaces with ONE suitable word. Write your answers on ANSWER SHEET 1. Do you believe that only boys do well in science Does it seem to you that (31) have better vocabularies than boys (32) your opinion, are boys better at building thins If your answer to each of those questions is "Yes", you (33) right, according to an article in Current Science. There are exceptions, but here are the facts. On the (34) , males score higher on tests that measure mathematical reasoning, mechanical ability, and problem-solving skills. (35) show superior ability in tests measuring vocabulary, spelling, and memory. But these (36) will probably not always exist. In the future, a person’s abilities may not be determined (37) sex. As one scientist (38) "Nothing is impossible for a person to be or do. " In several recent studies, young babies have been observed and tested to discover (39) different abilities are developed. A scientific team headed by Jerome Kagan, a psychologist at Harvard University, is studying the thinking ability of children 11.5 months (40) . The test is a simple one. The (41) , while seated on it mother’s lap, watches a "show" on a small theater stage. In Act One of the show, an orange-colored block is lifted from blue box and moved slowly across the stage. Then (42) is returned to the box. This is repeated six times. Act (43) is similar, except that the orange block is smaller. Baby boys do not seem to notice the difference in the size of the block, but girls immediately become excited and begin to make noises that sound (44) language. They seem to be trying to talk. It is (45) that bones, muscles, and nerves develop faster in baby girls. Usually, too, baby girls talk (46) an earlier age than boys do. Scientists think there is a physical reason (47) this. They believe that nerves in the left side of the brain develop faster in girls than in boys. And it is this side of the (48) that strongly influences an individual’s ability to use words, to spell, and to remember things. By the time they start to school, therefore, little girls have an advantage that boys do not have. Girls are physically more ready to (49) facts, to spell, and to read. These, of course, are (50) that are important in elementary school.
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