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【简答题】
Thomas Jefferson was not only a man of ______(1) , he was also a man of _____(2). He believed that, rather than simply learn from _____(3) , one should _____(4) in personal investigations to gain knowledge from its source. He also believed that one could obtain ______(5) knowledge not only from expert people of higher classes, but also from people of humble ____(6) . Jefferson felt that one must think for himself rather than simply seek _____(7) with others; and that it was _____(8) to go out of one’s way to avoid _____(9) or conflict. In spite of his ____(10) , Jefferson constantly held to and acted on his own beliefs. Americans owe much to Thomas Jefferson for the legacy of ideas and examples he left behind.
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皮皮学刷刷变学霸
举一反三
【单选题】环境污染是指
A.
环境中的污染物的数量或浓度超过了环境的自净能力
B.
环境中的污染物造成了环境质量的恶化
C.
环境中的污染物影响了人体健康
D.
A+C
E.
A+B +C
【简答题】比较时期数列和时点数列的特点和作用。
【单选题】有关单相异步电动机的旋转磁场，描述不正确的是
A.
单相交流电产生的磁通势是一个交变的脉动量，而非一个旋转的量。
B.
一个交变脉动的磁通势，可以分解为两个幅值相等、转速相等、反向旋转的磁通势。
C.
一个交变脉动的磁通势，可以分解为两个幅值相等、转速相等、同向旋转的磁通势。
D.
两个反向旋转的磁通势会形成两个反向的旋转磁场，在转子中会形成两个对称于原点的机械特性曲线。