题目内容

You can use my computer ______ ( whenever ) you like

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The computer made a(n)_____ ( errors ) on my phone bill (账单)

Mr. White helped the poor old woman _____ of sympath

The little girl got much ______ from her father when she told him about her pa

A. detail
B. energy
C. sympat
D. suggestion

两个初相相等、振幅不等的相干波源，分别由A 、B两点向C点无衰减的传播。波长为λ，AC=5λ，BC=10λ。则C点处的振动一定：

A. 加强
B. 减弱
C. 振幅为0
D. 无法确定