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【单选题】
若增大SPWM逆变器的输出电压基波频率,可采用的控制方法是
A.
增大三角波幅度
B.
增大三角波频率
C.
增大正弦调制波频率
D.
增大正弦调制波幅度
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参考答案:
举一反三
【判断题】人类同卵双生中,姐妹间的差异往往要大于兄弟之间的差异。
A.
正确
B.
错误
【单选题】一般实行土葬的民族是
A.
满族
B.
蒙古族
C.
回族
D.
维吾尔族
【单选题】在备抵法下,企业将不能收回的应收账款确认为坏账损失时,应冲减资产减值准备,并冲销相应的应收账款。( )
A.
正确
B.
错误
【判断题】人类同卵双生中,姐妹间的差异往往大于兄弟之间的差异。 (中山大学2005年考研试题)
A.
正确
B.
错误
【单选题】听力原文:W: I haven't seen you for a while. Have you been away? M: Yes, I just got back from vacation. I took a tour around the Great Lakes. Have you ever been there? W: Oh, yes! When I was young, I lived...
A.
Unites States Canadian agreements.
B.
Unlimited growth in population.
C.
Pollution in the Great Lakes.
D.
The limitea supply of phosphates.
【单选题】听力原文:M: What happened to you? You're so late today. W: The bus I took broke down in front of the hospital and I had to walk from there. Q: Why was the woman so late? (5)
A.
She took somebody to the hospital.
B.
Something went wrong with the bus.
C.
She came on foot instead of taking a bus.
D.
Something prevented her from catching the bus.
【判断题】满族一般实行土葬,忌在西炕和北炕死人,人死入棺后从窗户抬出。()
A.
正确
B.
错误
【简答题】GIS系统的核心是 。
【简答题】在备抵法下,企业将不能收回的应收账款确认为坏账损失时,应计入资产减值准备,并冲销相应的应收账款。( )
【单选题】在备抵法下,企业将不能收回的应收账款确认为坏账损失时,应计入资产减值准备,并冲销相应的应收账款。 ( )
A.
正确
B.
错误
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