單項(xiàng)選擇題某質(zhì)點(diǎn)參與S14cos(3πt+π/3)cm和S2=3cos(3πt-π/6)cm兩個(gè)同方向振動(dòng)的簡(jiǎn)諧振動(dòng),其合振動(dòng)的振幅為:()

A.1cm
B.7cm
C.5cm
D.5.9cm


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