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【单选题】
一弹簧振子,当把它水平放置时,作简谐振动。若把它竖直放置或放在光滑斜面上,试判断下列情况正确的是( )。A.
竖直放置作简谐振动，在光滑斜面上不作简谐振动
B.
竖直放置不作简谐振动，在光滑斜面上作简谐振动
C.
两种情况谐振动
D.
两种情况都不作简谐振动
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