更多“设A是4×3矩阵，且r(A)=2，B=，则r(AB)=___”相关的问题
对无行为能力的未成年人的信件除由( )开拆外，任何组织或个人不得开拆。
A．其班主任
B．其父母
C．其监护人
D．其同学
E．其校长
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第二篇 Too Late to Regret It When I was a junior, I met a seco...What did he do to make her happy
A．He studied much harder.
B．He often took her for a ride.
C．He always endured her insults.
D．He often bought her presents and meals.
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心胸满闷，隐痛阵发，痛有定处，时欲太息，遇情志不遂时容易诱发或加重，兼胸脘胀闷，得嗳气或矢气则舒，苔薄或薄腻，脉细弦。可选主方（）
A.柴胡疏肝散
B.血府逐瘀汤
C.栝蒌薤白半夏汤合涤痰汤
D.参附汤合右归丸
E.枳实薤白桂枝汤合当归四逆汤
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产生薄厥的病因（）。
A.过度恐怖，恐则气下
B.过度喜笑，喜则气缓
C.过度愤怒，怒则气上
D.过度悲哀，悲则气消
E.过度思虑，思则气结
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请就建构主义是当代教学理论的重大发现展开论述。
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A . 贝多芬
B . 海顿C . 舒伯特D . 莫扎特
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生长在鲍-金培养基上的百日咳鲍特茵菌落为
A.紫色
B.褐色
C.银灰色
D.灰白色
E.黑色
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15
软件的复杂性主要体现在程序的复杂性。(15)是度量软件复杂件的一个主要参数。若采用McCabe 度量法计算环路复杂性，则对于下面所示的程序图，其环路复杂度为（16)。
A . 代码行数B . 常量的数量C . 变量的数量D . 调用的库函数的数量
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在商务谈判中有很多注意事项，下列说法正确的有（）。
A．赠送礼物时，要讲究礼物的价值、类型、包装等
B．酒席谈话要注意他人隐私和习惯
C．私下交往要守时守约
D．介绍时，应将长辈或身份较高的人介绍给晚辈或身份低的人
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步法中，上步时，后脚蹬地发力，扭腰转胯，后脚沿（）向前迈步A.弧线B.直线C.折线
步法中，上步时，后脚蹬地发力，扭腰转胯，后脚沿（）向前迈步A.弧线B.直线C.折线
A.弧线B.直线C.折线
B.直线C.折线
C.折线
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检验站设置要有适宜的检验活动环境具体表现在（）。
A、要满足生产作业过程的需要
B、要有合适的存放和使用检验工具、检验设备的场地
C、要有存放等待进行检验产品的面积
D、方便检验人员和作业（操作）人员的联系
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The Doctor in AmericaSelf-employed private physicians who charge a fee for each patient visit have been the norm for American medical practice. Most physicians have a contract relationship with one or more hospitals in their community. They refer their patients as needed to the hospital, which usually charges according to the number of days a patient stays and the facilities—X—rays, operating rooms, tests—he or she uses.Some medical doctors are on salary. Salaried physicians may work as hospital staff members, or residents, who are often still in training. They may teach in medical schools, be hired by corporations to care for their workers or work for the federal government"s Public Health Service.Physicians are among the best-paid professionals in the United States. In the 1980s, it was not uncommon for medical doctors to earn incomes of more than $100,000 a year. Specialists, particularly surgeons, might earn several times that amount. Physicians list many reasons why they deserve to be so well rewarded for their work. One reason is the long and expensive preparation required to become a physician in the United States. Most would-be physicians first attend college for four years, which can cost nearly $20,000 a year at one of the best private institutions. Prospective physicians then attend medical school for four years. Tuition alone can exceed $10,000 a year. By the time they have obtained their medical degrees, many young physicians are deeply in debt. They still face three to five years of residency (住院医生实习期) in a hospital, the first year as an apprentice physician. The hours are long and the pay is relatively low.Setting up a medical practice is expensive, too. Sometimes several physicians will decide to establish a group practice, so they can share the expense of maintaining an office and buying equipment. These physicians also take care of each other"s patients in emergencies.Physicians work long hours and must accept a great deal of responsibility. Many medical procedures, even quite routine ones, involve risk. It is understandable that physicians want to be well rewarded for making decisions which can mean the difference between life and death.
A．RightB．WrongC．Not mentioned
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关于肿瘤转移，叙述正确的是
A．乳腺癌转移至锁骨上、下淋巴结为血行转移B．肺部转移至骨或脑为淋巴路转移C．胃癌转移至卵巢为种植性转移D．淋巴转移为癌的最常见转移方式E．血行转移为癌的最常见转移方式
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最可能的诊断是
A．先兆子宫破裂B．妊娠合并阑尾炎C．胎盘早剥D．子宫破裂E．羊水栓塞
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