题目内容
A sub-thesis is considered as a _______that will be used as the ________ idea of each section or paragraph.
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What are the questions you should ask to ensure that your thesis is effective and clear?1) Is there an argument?2) Is there a _________________?3) Is it _____________?4) It is specific?5) Does it declare its _____________?
单相变压器通入正弦激磁电流，二次侧的空载电压波形为（）
变压器接在电网上运行时，变压器（）将由于种种原因发生变化，影响用电设备的正常运行，因此变压器应具备一定的调压能力
变压器的额定频率即是所设计的运行频率，我国为（）Hz
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