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【单选题】
( 3023 ) 一弹簧振子,当把它水平放置时,它可以作振动.若把它竖直放置或放在固定的光滑斜面上,试判断下面哪种情况是正确的:A.
竖直放置可作简谐振动，放在光滑斜面上不能作简谐振动．
B.
竖直放置不能作简谐振动，放在光滑斜面上可作简谐振动．
C.
两种情况作简谐振动．
D.
两种情况都不能作简谐振动．
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【简答题】We guarantee to refund your money if you are not delighted with your ___________.
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B.
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C.
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D.
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