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【多选题】
根据软开技术发展的历程可以将软开关电路分成 。
A.
准谐振电路
B.
零开关PWM电路
C.
零转换PWM电路
D.
谐振变换电路
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【简答题】“This is the BBC News at Eight O’ Clock.” … “Chinese people spent about 120 billion yuan during the first three days of the May Golden Week last year. This year it has increased to 140 billion yuan.” ...
【简答题】阅读理解。 Here is the Eight O'clock News. … Chinese people spent about 120 billion yuan during the first three days of the May Golden Week last year. This year it has increased to 140 billion yuan. The ch...
【单选题】During golden weeks we often witness tourists ( ) their way through the throng in some popular scenic spots, say, West Lake, Yellow Mountain and the Great Wall.
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usher
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find
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【单选题】下列哪种情况易引起溶血
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10% 葡萄糖溶液
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0.9%NaCl溶液
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【简答题】“Here is the Eight O’ Clock News.” “Chinese people spent about 120 billion yuan during the first three days of the May Golden Week last year. This year it has increased to 140 billion yuan.” “The chil...
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【单选题】下列哪种情况易引起溶血
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B.
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0.9% NaCl
D.
5% 葡萄糖
【多选题】人力资本是( )共同投资的结果。
A.
国家
B.
企业
C.
社会团体
D.
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E.
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A.
①②
B.
②③
C.
①④
D.
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【单选题】Excel中的公式以( )开头
A.
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D.
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