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Practice 2 Until recently, scientists knew little about life in the deep sea, nor had they reason to believe that it was being threatened. Now, with the benefit of technology that allows for deeper exploration, researchers have uncovered a remarkable array of species inhabiting the ocean floor at depths of more than 660 feet, or about 200 meters. At the same time, however, technology has also enabled fishermen to reach far deeper than ever before, into areas where bottom trawls can destroy in minutes what has taken nature hundreds and in some cases thousands of years to build. Many of the world's coral species, for example, are found at depths of more than 200 meters. It is also estimated that roughly half of the world's highest seamounts - areas that rise from the ocean floor and are particularly rich in marine life - are also found in the deep ocean. These deep sea ecosystems provide shelter, spawning and breeding areas for fish and other creatures, as well as protection from strong currents and predators. Moreover, they are believed to harbor some of the most extensive reservoirs of life on earth, with estimates ranging from 500,000 to 100 million species inhabiting these largely unexplored and highly fragile ecosystems.
泄泻适宜服用山楂、鸡内金粉的证候是（）。
女性，45岁。发现右乳腺外上象限约5cm×4cm包块6个月。包块质中，边界较清楚，粗针穿刺活检诊断为乳腺肉瘤。宜采取的治疗方法是（）。
沿海地区水下岸坡上泥沙纵向运动具有什么规律？在岸线向海或向陆转折处，会形成哪些地貌类型？
有以下程序：#include <stdio.h>#include <string.h>main(){ char str[12]={'s', 't', 'r', 'I', 'n', 'g'}; printf("%d",strlen(str));}程序运行后的输出结果是（ ）。
甲国居民有来源于乙国的所得100万元，甲乙两国的所得税税率分别为30%、20%，两国均行使地域管辖权和居民管辖权。在抵免法下甲国应对该笔所得征收所得税（）万元。
渐变滤色镜是一种逐渐改变景物颜色或景物光线亮度的滤色镜。
求解大型矩阵对策问题时，通常可以采用优超降阶法化简问题，并减少计算量。
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下列叙述中正确的是（ ）。
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为什么经常看到电梯都在维修中？
电梯维修注意事项中规定：电梯维修单位应取得行业主管部门（）后，方能从事相应的维修业务。
电梯维修注意事项中规定：电梯维修单位应取得行业主管部门（）后，方能从事相应的维修业务。
电梯维修保养时（）
电梯维修管理必须注意（）等。
电梯维修未结束而维修人员要离开现场时，对无法关闭的厅门，必要时应留人现场值班。（）
电梯维修单位应制订电梯事故应急防范措施和救援预案并定期演练，而使用单位则不需要
电梯的维修必须由电梯（）单位或者通过合同委托、同意并取得许可的单位进行。
电梯维修单位应制订电梯事故应急防范措施和救援预案并定期演练，而使用单位则不需要。
电梯层门钥匙只有维修人员和电梯司机可以使用。（ ）