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【单选题】
滤波的作用是A.
滤除交流电
B.
滤除脉动直流电中的交流成份
C.
滤除直流电
D.
把直流电整流成交流电
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反馈参考答案：
举一反三
【单选题】Shaniq has seen two movies this week and two baseball games. Her marginal utility of one more movie is 20 and her marginal utility of one more baseball game is 30. Shaniq will go to a baseball game to...
A.
no matter how much more the baseball game costs compared to the movie.
B.
if the baseball game costs $10.00 and the movie costs $7.00.
C.
if the baseball game costs $10.00 and the movie costs $5.00.
D.
Both answers B and C are correct.
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【简答题】山下兰芽短浸溪,松间沙路净无泥,潇潇暮雨子规啼。谁道人生无再少?____!休将白发唱黄鸡。《浣溪沙》苏轼
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