若4x﹣3y﹣6z=0，x+2y﹣7z=0（xyz≠0），则$\frac{5x^2+2y^2-z^2}{3x^2-3y^2-10z^2}$的值等于____ ．

给实验鼠静脉注射不同剂量的胰岛素，测得血糖的补充速率和消耗速率如图所示。下列相关分析正确的(    ）

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    In certain countries of the world，the king or queen is still the head country。The UK is one of these countries。So that does the British royal family(皇室) represent for the British people today? Well，a large number of things。The royal family are of course a part of British history and tradition。They still have an important and meaning for many people today。It just wouldn't feel the same if there were no royal family。In addition to that，the queen has important formal duties：

    ●as head of the state，the Queen represents the UK on visits other would leaders to visit the UK.

    ●as head of the armed force，only the Queen can declare when the UK is at war or when the war is over。

    ●as head of the Church of England。

    Not just the Queen，the royal family spend a great deal of their time traveling up and there should be royal family。Sometimes the press and media criticize（批评）the royal family as well。One criticism is that the British people should not have to pay for the royal through their taxes。Another is that the Buckingham Palace should be open to the public more often，in order to pay for the building repairs that are necessary。