美国1787年联邦宪法确立了一套“地域和体制的双向平衡机制”，是孟德斯鸠“以权力制约权力”学说第一次在政府体制的设计方面得到较好的贯彻。这种机制不包括（    ）

     We have no idea about  1 men first began to use salt. But we do know that it had been used in many different ways 2 the history.
For example, in many history books it is 3that people who lived three thousand years ago 4salted fish. Thousands of years ago in Egypt（埃及）, salt 5 keep the dead. It can keep the dead bodies6decay.（腐烂）
   In the eighteenth century, a person who stole salt was 7 to have broken the 8. if a person was caught stealing salt, he would be thrown into 9. Books also record that in England about ten thousand people were put into prison during that century10stealing salt! In the year 1553, if a man took 11than his share of salt, he would be thought to have broken the law and would be12 punished(惩罚).
   oSalt was very13 on the dinner table of a king. It was always put14 the king when he sat down to eat. Then important visitors sat near the salt15 less important visitors were given seats farther away from it.

如图，△ADE∽△ABC，若AD=1，BD=2，则△ADE与△ABC的相似比是（    ）

中华民国成立之初，在行政权方面拟实行总统制，但《临时约法》最终规定实行责任内阁制。这种变化的背景是

如图所示的电路，电源电压保持不变，闭合开关S₁、S₂，电压表示数为3V，电流表示数为0.3A，断开S₂后，电压表示数为2V，则下列判断正确的是（   ）