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不得不进入煤气大量泄漏区域进行抢救工作的人员应该（）。
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在糖异生中有（）个重要的酶起关键作用，它们是（）酶、（）酶、（）酶、（）酶。
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完全脱位牙如果不能即时复位，对患牙可采取的措施不包括（）。
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用于吐血、衄血、便血、崩漏，为补血止血要药的药物是（）。
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高压管道的直管段允许用焊接方法接长，但其长度不得小于（）mm。
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滚动轴承保持架磨下的金属微粒在滚道与滚子及套圈之间摩擦，会造成滚动轴承（）。
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SCI指的是（）。
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Once we learn the rules for map reading, they seem so simple: up is north, blue is water, a star stands for a capital. But when and how do we learn to read a map? Research shows that even three-year-olds can master, at least in a basic way, the key map-reading concept(概念): a map is a two-dimensional symbol(二维的符号)for three-dimensional space. Linda Acredolo of the University of California, showed a child a map of a room pointed out on it where a toy was hidden and asked the child to find that toy. Depending on the maps orientation(方位), about half the three-year-olds could successfully do so. Three years may be the age at which the ideas become fully understood. Judy Deloache of the University of Illinois let children watch her hide a small toy in a scale model of a room and asked them to find a large one in a real room. "A three-year-olds can do it, but a two-year-olds has no idea that the model has to do with anything larger, " she says. But even if the basic concept is there early, Lynn Liben and Roger Downs of Pennsylvania State University found that children still have a lot to learn. Second graders believe that north is always at the top of a map because of the hanging maps they have seen. "If you asked them to close their eyes and point in the direction of north, often theyll point straight up," says Lihen. She says that children get map-reading skills gradually, and teachers must begin by using maps of familiar areas: their own classrooms, homes, and neighbourhoods.The first two experiments show that______.A．children have better understanding than grown-upsB．children have special natural ability for map readingC．children are more interested in toys than in mapsD．children can start to learn map-reading early
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中心型肺癌X线不易发现的征象为（）
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办理储蓄的邮政机构必须符合国家银监委规定的条件并接受监督，开办的储蓄业务种类必须经国家（）批准。