A、S<sub>1</sub>比S<sub>2</sub>超前<img width="23" height="34" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/3b359fc8-ac55-4ae2-94c1-c352edb765e8.jpg" />
B、S<sub>1</sub>比S<sub>2</sub>超前<img width="18" height="30" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/1cd6bb93-23ee-4643-a05f-0da41e5182ed.jpg" />
C、S<sub>2</sub>比S<sub>1</sub>超前<img width="23" height="34" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/3b359fc8-ac55-4ae2-94c1-c352edb765e8.jpg" />
D、S<sub>2</sub>比S<sub>1</sub>超前<img width="18" height="30" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/1cd6bb93-23ee-4643-a05f-0da41e5182ed.jpg" />
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λ（λ为波长），设两波在S1、S2连线上传播时，它们的振幅都是A，且不随距离变化，已知在该直线上在S1左侧各点的合成波的强度为其中一个波强度的4倍，则两波源应满足的相位条件是（ ）。