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【单选题】
SPWM技术中,调制波时频率和期望波相同的()。A.
正弦波
B.
C.
等腰三角波
D.
锯齿波
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举一反三
【单选题】---People should use public transport instead of their own private cars. --- _______.The roads are too crowd as it is.
A.
All right.
B.
Exactly.
C.
Go ahead.
D.
Fine.
【单选题】People should be able to come to a decision about ions in the air if they _______.
A.
note their own reactions
B.
move to a healthier, area
C.
observe domestic animals
D.
watch how wealthy people behave
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