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{{B}}Snowflakes{{/B}} You’ve probably heard that no two snowflakes are alike. Of course, nobody has ever confirmed that statement by examining every one of the estimated one septillion snowflakes that drift to Earth each year. Still, Kenneth Libbrecht, a professor at the California Institute of Technology, is confident that the statement is true. Snowflakes aren’t flaky, says Libbrecht. At their basic level, they’re crystalline. The lattice of every snowflake is six-sided in shape. The simplest snow crystals are six-sided flat plates and six-sided columns. Such crystals are common in places where the air is extremely cold and dry. Snow crystals acquire their special beauty when their simple six-sided symmetry blossoms. Under the right conditions, each of the s A. create snow crystals of different shapes. B. make crystals that look similar to one another. C. create snowflakes that are exactly alike. D. refine his techniques. [判断题]进出配电站、开闭所应随手关门。
A.正确 B.错误 [单项选择]节约用水、高效用水是缓解水资源供需矛盾的（）。
A. 根本途径 B. 最佳举措 C. 核心 D. 基本方法 [单项选择]美国的国家临床实验室标准委员会（NCCLS）用于临床化学干扰实验的文件是（）
A. EP5－A B. EP6－P2 C. EP7－P D. EP9－A E. EP10－A [判断题]( ) 调动专运、公务及特种用途车辆时，调动前必须按1：5的比例接通软管并进行自动制动机简略试验。
A.正确 B.错误 [多选题]刑事赔偿义务机关有？
A.公安机关 B.检察院 C.法院 D.狱政管理机关 [单项选择]以人力资源受教育程度来考察的人力资源组合情况称为（）。
A. 人力资源自然结构 B. 人力资源文化结构 C. 人力资源专业技能结构 D. 人力资源业务结构 [单选题]下列均属于特种用途车的是（）。
A.家畜车、毒品车、长大货物车 B.家畜车、毒品车、救援车 C.救援车、检衡车、除雪车 D.水泥车、毒品车、检衡车 [单项选择]（）不是毒品的原料和半成品。
A. 鸦片 B. 大麻 C. 罂粟籽 D. 海洛因 [判断题]铁总运【2015】362号《高速铁路接触网运行维修规则》整正支柱使用的垫片不得超过4块。每块垫片的面积不小于50mm×100mm，厚度不大于10mm。
A.正确 B.错误 我来回答: 提交
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