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磷酸二氢钾是一种高浓度磷钾复合肥，价格较贵，常作根外追肥。
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完形填空：下面的短文有l5处空白，请根据短文内容为每处空白确定l个最佳选项。 Obesity(肥胖) Causes Global Warming. The list of ills attributable to obesity keeps growing: Last week, obese people were accused of causing global warming. This ______(51)comes from Sheldon Jacobson of the University of Illinois, US, and a doctoral student, Laura McLay. Their study ______(52) how much extra gasoline is needed to haul fat Americans around. The answer, they say, is a billion gallons of gas per year. ______(53) There has been ______(54) for taxes on junk food in recent years. US economist Martin Schmidt suggests a tax on fast food ______(55)to people’s cars. "We tax cigarettes partly because of their health cost," Schmidt said. "Similarly, leading a lazy life style will end ______(56) costing taxpayers more." US political scientist Eric Oliver said his first instinct was to laugh at these gas and fast food arguments. But such ______(57) are getting attention. At the US Obesity Society's annual meeting, one person ______(58) obesity with car accident deaths, and another correlated obesity with suicides. No one asked whether there was really a cause-and-effect relationship. " The funny thing was that everyone took it ______(59)." Oliver said. In a 1960s study, children were ______(60) drawings of children with disabilities and without them, and a drawing of an obese child. They were asked ______(61) they would want for a friend? The obese child was picked last.Three researchers recently repeated the study ______(62) college students. Once again, ______(63) no one, not even obese people, liked the obese person. " Obesity was stigmatized." the researchers said. But, researchers say, getting______ (64) is not like quitting smoking. People struggle to stop smoking, and, in the end, many succeed. Obesity is different. Science has shown that they have limited personal control over their weight Genes also______ (65) a part. 64.(单项选择题)
在保证工程和质量、不违反劳动安全和环境保护的原则下，（ ）是选择新技术方案的主要原则。
瓦斯保护只能反应于变压器内部的不正常情况和轻微故障。( )
男性，60岁。腹部挤压伤后48小时发生急性弥漫性腹膜炎，急症手术发现结肠穿孔，行穿孔处结肠外置、腹腔引流术。术后发热39℃，轻度腹胀，有排气排便。术后第2天尿量由40ml／h以上，逐渐减少至25ml／h以下，患者神志清楚。经补液仍不见好转。为观察病情变化，最有价值的监测是（）。
试给出单群理论的临界方程。
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设其中D＝{（x，y）|（x－1）2＋（y－1）2≤2}，则（ ）。
设其中D＝{（x，y）|（x－1）2＋（y－1）2≤2}，则（ ）。
已知两直线l1：（x-4）／2=（y+1）／3=（z+2）／5和l2：（x+1）／-3=（y-1）／2=（z-3）／4，则它们的关系是（）
若直线（x－1）/1＝（y＋1）/2＝（z－1）/λ与（x＋1）/1＝（y－1）/1＝z/1相交，则必有（ ）。
若直线（x－1）/1＝（y＋1）/2＝（z－1）/λ与（x＋1）/1＝（y－1）/1＝z/1相交，则必有（ ）。
若直线（x－1）/1＝（y＋1）/2＝（z－1）/λ与（x＋1）/1＝（y－1）/1＝z/1相交，则必有（ ）。
若直线（x－1）/1＝（y＋1）/2＝（z－1）/λ与（x＋1）/1＝（y－1）/1＝z/1相交，则必有（ ）。
设空间直线L1：（x－1）/1＝（y＋1）/2＝（z－1）/λ，L2：x＋1＝y－1＝z相交于一点，则λ＝____。
设空间直线L1：（x－1）/1＝（y＋1）/2＝（z－1）/λ，L2：x＋1＝y－1＝z相交于一点，则λ＝____。
已知两直线的方程L1：（x－1）/1＝（y－2）/0＝（z－3）/（－1），L2：（x＋2）/2＝（y－1）/1＝z/1，则过L1且与L2平行的平面方程为___...