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【单选题】
两个同方向同频率的振动,其合振动的振幅为0.20m,合振动与第一分振动的相位差为60 度,已知第一分振动的振幅为0.10m,则 (1)第二分振动的振幅为( )m。 (2)第二分振动与第一分振动的相位差为( )。A.
（1）0.137 （2）
B.
（1）0.137 （2）
C.
（1）0.173 （2）
D.
（1）0.173 （2）
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